JP2018045919A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To block the induction of thermal runaway of a cylindrical battery 1 and reduce the weight and size of the whole.SOLUTION: The battery pack comprises: a battery unit 2 in which a plurality of cylindrical batteries 1, with end faces arranged on the same plane in parallel posture, are arrayed in one row or a plurality of rows; heat radiation fins 4 connected in a thermal coupling state to the cylindrical batteries 1 by being contacted face to face; and a first heat conduction plate 31 and a second heat conduction plate 32 connected in a thermal coupling state to the heat radiation fins 4 and arranged in a posture to extend in the array direction of the cylindrical batteries 1. The heat radiation fins 4 include a first and a second radiation fin 42 arranged adjacent to each other and connected to the cylindrical batteries 1, the first heat conduction plate 31 and the second heat conduction plate 32 include a first and a second heat conduction plate 32 arranged in a mutually non-thermal coupling state, with the first radiation fin 41 and the second radiation fin 42 thermally coupled to the first heat conduction plate 31 and the second heat conduction plate 32, respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an assembled battery including a plurality of cylindrical batteries, which prevents a thermal runaway of one cylindrical battery from inducing a thermal runaway of another cylindrical battery in the vicinity.

  A rechargeable cylindrical battery may cause thermal runaway due to various causes such as internal short circuit or overcharge. For example, when a lithium ion secondary battery runs out of heat, the battery temperature may rapidly increase to 300 ° C. to 700 ° C. or higher. If any one of the cylindrical batteries causes thermal runaway and induces thermal runaway of the adjacent cylindrical battery, a large number of cylindrical batteries cause thermal runaway, resulting in a problem that the energy of the thermal runaway becomes extremely large. This adverse effect can be solved by embedding all or part of the cylindrical battery in the heat conductive resin and absorbing the thermal energy of the thermally runaway cylindrical battery in the heat conductive resin. (See Patent Documents 1 to 3)

Japanese Utility Model Publication No. 6-80260 JP 2014-86342 A Japanese Patent Application No. 2014-212551

  As shown in FIG. 10, the assembled battery of Patent Document 1 has an exterior case 83 filled with a heat conductive resin 87 and a cylindrical battery 81 is embedded in the heat conductive resin 87. This assembled battery can be absorbed by the heat conductive resin 87 in which the thermal energy of the cylindrical battery 81 is embedded.

  In addition, as shown in the exploded perspective view of FIG. 11, the assembled battery of Patent Document 2 has a battery core pack 90 placed in the bottom case 93 in a state where the bottom portion of the bottom case 93 is filled with a heat conductive resin 97. The lower part of the cylindrical battery 91 is dipped in a fluid heat conductive resin 97, and the heat conductive resin 97 is cured in this state. This assembled battery is manufactured by filling the bottom case with a heat conductive resin through a gap between the battery core packs and curing the heat conductive resin with the battery core pack in the bottom case.

  Furthermore, as shown in the cross-sectional view of FIG. 12, the assembled battery of Patent Document 3 is configured such that a plurality of cylindrical batteries 71 are placed on a battery holder 72, arranged in the same plane, placed in a fixed position, and heated to the cylindrical battery 71. A thermally conductive resin 77 is filled so as to be bonded. The battery holder 72 arranges the cylindrical batteries 71 in the holding grooves 73 in a plurality of rows, fills the thermal conductive resin 77 between the adjacent cylindrical batteries 71, and brings the thermal conductive resin 77 into close contact with the cylindrical battery 71. And placed in a heat conducting state.

  The above assembled battery conducts the thermal energy of the thermally runaway cylindrical battery to the thermally conductive resin, and diffuses the thermal energy with the thermally conductive resin to prevent thermal runaway. However, in the above battery unit, a thermal conductive resin is arranged between adjacent cylindrical batteries, so that the thermal energy of the cylindrical battery that has runaway via the thermal conductive resin is conducted to the adjacent cylindrical battery, causing thermal runaway. May be triggered. In particular, the structure in which a thermal conductive resin is filled between a plurality of cylindrical batteries has a thin thermal conductive resin that is filled in a portion where adjacent cylindrical batteries are closest to each other. Thermal energy is conducted to the adjacent battery and thermal runaway is likely to be induced. In order to prevent this harmful effect, it is necessary to increase the space between adjacent cylindrical batteries and increase the thickness of the thermally conductive resin that fills the closest part. There is a drawback that the heat conductive resin becomes heavy.

  The present invention has been developed for the purpose of solving the above-mentioned drawbacks. An important object of the present invention is to provide an assembled battery that can be reduced in size and weight while effectively preventing induction of thermal runaway of the cylindrical battery.

Means for Solving the Problems and Effects of the Invention

  The assembled battery of the present invention has a battery unit in which a plurality of cylindrical batteries are arranged in parallel and both end faces are arranged in the same plane and arranged in one or a plurality of battery rows, and the cylindrical battery is in surface contact with the heat. A heat dissipating fin connected to the coupled state; and a heat conducting plate connected to the heat dissipating fin in a thermally coupled state and arranged in a posture extending in the arrangement direction of the cylindrical batteries. The radiating fin includes a first radiating fin and a second radiating fin which are alternately connected to a cylindrical battery arranged adjacent to each other, and the first radiating fin and the second radiating fin are non-heated. Arranged in a combined state. The heat conduction plate further includes a first heat conduction plate and a second heat conduction plate which are arranged in a non-thermally coupled state, and the first heat radiating fin is thermally coupled to the second heat conduction plate. The second heat dissipating fin is connected to the second heat conducting plate in a heat-coupled state without being thermally coupled to the first heat-conducting plate. Yes.

  The above assembled battery is characterized in that the entire battery can be reduced in size and weight while effectively preventing thermal runaway of the cylindrical battery. That is, the above assembled battery is connected to the first heat radiation plate and the second heat conduction plate respectively connected to the first heat conduction plate and the second heat conduction plate in a non-thermally coupled state, and is adjacent to the cylindrical battery. This is because the thermal energy of adjacent cylindrical batteries is alternately conducted to the first heat conduction plate and the second heat conduction plate which are in a non-thermally coupled state. The above assembled battery does not conduct the heat generated by the thermally runaway cylindrical battery to the adjacent cylindrical battery. The thermal energy of the cylindrical battery that has generated heat due to thermal runaway is conducted to the heat conduction plate through the radiation fins, but this heat conduction plate is not a heat conduction plate thermally coupled to the adjacent cylindrical battery. The cylindrical battery placed next to the thermal runaway cylindrical battery is in a non-thermally coupled state with the thermal conduction plate connecting the thermal runaway cylindrical battery, and is coupled in thermal coupling with another thermal conductive plate. The heat is dissipated. The thermal energy of the thermal runaway cylindrical battery does not conduct heat to the adjacent cylindrical battery. Cylindrical battery thermal runaway is most likely to be induced in the adjacent cylindrical battery. In particular, an assembled battery that dissipates the thermal energy of a cylindrical battery with heat radiation fins and a heat conduction plate shortens the distance of heat conduction, increases the amount of conduction heat, and is placed closer together, so the heating energy due to radiant heat is also large. Because it becomes.

  The above assembled battery conducts and diffuses the thermal energy of a cylindrical battery that has been thermally runaway via a heat-dissipating fin and a heat conducting plate, but is not conducted to the adjacent cylindrical battery via a heat conducting plate, and is most thermally runaway. It is possible to effectively prevent the thermal runaway of the adjacent cylindrical battery that is easy to perform. In addition, the above assembled battery changes the conduction path of the thermal energy of the thermally runaway cylindrical battery to prevent induction of thermal runaway, so that the interval between adjacent cylindrical batteries is widened, or between adjacent cylindrical batteries. Even in a structure in which a thick heat insulating layer having excellent heat insulating properties is not provided, the induction of thermal runaway can be prevented, so that the entire structure can be reduced in size and weight to effectively prevent the induction of thermal runaway.

  In the battery pack of the present invention, the first heat conductive plate and the second heat conductive plate are arranged on both sides of each battery row and in a plane parallel to a plane including the longitudinal direction of the cylindrical battery. A first heat conducting plate in which first and second heat dissipating fins connected in a thermally coupled state to cylindrical batteries disposed adjacent to each other in rows are arranged on the opposite side of each battery row And can be thermally coupled to the second heat conducting plate.

In the assembled battery of the present invention, a plurality of cylindrical batteries are arranged in a row to form a battery unit, and adjacent cylindrical batteries are alternately fitted to the first and second radiating fins. Thus, the heat energy can be transferred to the first heat conduction plate and the second heat conduction plate which are in a non-thermally coupled state.
Furthermore, the assembled battery of the present invention is a battery unit in which cylindrical batteries are arranged in a plurality of battery rows, and the first heat conduction plate and the second heat conduction plate are alternately arranged on both sides of each battery row, Between each battery row, an intermediate heat conduction plate is arranged, an outer heat conduction plate is arranged on both sides of the battery unit, and heat radiation fins are connected to both sides of the intermediate heat conduction plate, The heat conduction plate can be structured such that a heat radiating fin is connected to one side.

The assembled battery of this invention can arrange | position a heat insulation sheet between the 1st radiation fin and the 2nd radiation fin which are arrange | positioned adjacently.
In the above assembled battery, since the heat insulating sheet is disposed between the first heat radiating fin and the second heat radiating fin, the heat insulating property between the first heat radiating fin and the second heat radiating fin is improved. There is a feature that can effectively prevent thermal runaway from being induced in the adjacent cylindrical battery.

  In the assembled battery of the present invention, a plurality of cylindrical batteries are arranged in one row or a plurality of battery rows to form a battery unit, and the first heat conduction plate and the second heat conduction plate are disposed at positions where the cylindrical batteries are penetrated. Disposed in parallel with each other in a non-thermally coupled state, the first heat conduction plate is connected to a through hole that connects the first radiating fin to the thermally coupled state, and a non-coupled that allows the second radiating fin to penetrate into the non-thermally coupled state A through hole is provided, and the second heat conducting plate is provided with a connecting through hole for connecting the second heat dissipating fin in a thermally coupled state and a non-bonded through hole for allowing the first heat dissipating fin to pass through in a non-thermally coupled state. The connecting through hole of the first heat conducting plate is placed at a position opposite to the uncoupled through hole of the second heat conducting plate, and the connecting through hole of the second heat conducting plate is placed on the first heat conducting plate. Cylindrical battery located adjacent to non-bonded through hole In addition, the first heat conducting plate and the second heat conducting fin can be used to form a structure that is thermally coupled to the first heat conducting plate and the second heat conducting plate that are disposed in a non-thermally coupled state. .

  In the above assembled battery, the heat conduction plate can be provided with the cylindrical battery penetrating the heat conduction plate. Therefore, the heat conduction plate can be thickened to improve the heat conduction characteristics, and the heat conduction plate can be provided between the cylindrical batteries. Therefore, the heat conduction plate can be shallowed and the heat conduction characteristics can be improved while the cylindrical battery is approached.

The assembled battery having the above-described structure can have a structure including two heat conductive plates each including a first heat conductive plate and a second heat conductive plate that are arranged apart from each other in a parallel posture.
Moreover, the assembled battery of this invention can be set as the structure provided with the 3 or more heat conductive plate which has arrange | positioned the 1st heat conductive plate and the 2nd heat conductive plate alternately with a parallel attitude | position.

  The assembled battery of this invention can improve a heat insulation characteristic, providing a heat insulation layer between heat radiation fins, and making the adjacent heat radiation fin approach mutually. Furthermore, in this assembled battery, since the heat insulating layer between adjacent radiating fins prevents heat conduction between the radiating fins, it is conducted to the adjacent radiating fin by the thermal energy of the radiating fin heated by the thermally runaway cylindrical battery. There is a feature that can effectively prevent the thermal runaway of the adjacent cylindrical battery.

  The assembled battery of the present invention can be formed in a cylindrical shape in which the heat dissipating fins are in close contact with the entire circumference of the cylindrical battery, or in a cylindrical shape having a slit in the axial direction in contact with a part of the surface of the cylindrical battery in a thermally coupled state. .

  In the assembled battery of the present invention, the heat conducting plate and the heat radiating fin can be integrated, and the heat radiating fin can be connected to the heat conducting plate.

  In the assembled battery of the present invention, the heat conduction plate and the heat radiation fin can be made of aluminum.

It is a schematic sectional drawing of the assembled battery concerning Embodiment 1 of this invention. It is a schematic sectional drawing of the assembled battery concerning Embodiment 2 of this invention. It is a schematic sectional drawing of the assembled battery concerning Embodiment 3 of this invention. It is a schematic perspective view of the assembled battery concerning Embodiment 4 of this invention. It is a disassembled perspective view of the assembled battery shown in FIG. FIG. 4 is an exploded cross-sectional view of the assembled battery shown in FIG. 3. It is a schematic sectional drawing of the assembled battery concerning Embodiment 1 of this invention. It is a schematic perspective view of the assembled battery concerning other embodiment of this invention. It is a schematic perspective view of the assembled battery shown in FIG. It is sectional drawing of the conventional assembled battery. It is a disassembled perspective view of the other conventional assembled battery. It is sectional drawing of the other conventional assembled battery.

  Embodiments of the present invention will be described below with reference to the drawings. However, the example shown below illustrates the assembled battery for embodying the technical idea of the present invention, and the present invention does not specify the assembled battery as follows. Further, this specification does not limit the members shown in the claims to the members of the embodiments.

  The assembled battery shown in FIG. 1 to FIG. 4 and FIG. 8 and FIG. 9 has a plurality of cylindrical batteries 1 in a parallel posture, with both end faces arranged on the same plane (FIG. 1) or a plurality of batteries. A battery case 2 is arranged in a case 6 as a battery unit 2 arranged in a row (FIGS. 2 to 4, 8, and 9). The assembled battery in FIGS. 1 to 4 has eight assembled batteries arranged in one battery row, and the assembled battery in FIGS. 8 and 9 has four cylindrical batteries arranged in one battery row. . However, the assembled battery of the present invention does not specify the number of cylindrical batteries 1 in one battery row as eight. For example, an assembled battery used for a power source of an electric vehicle such as a hybrid car includes a large number of cylindrical batteries. Therefore, a large number of cylindrical batteries are arranged in a single battery row and arranged in multiple rows. .

  The cylindrical battery 1 is a lithium ion secondary battery. Lithium-ion secondary batteries can increase the charge / discharge capacity with respect to volume and weight, so they can be made smaller and lighter and have a larger capacity. However, they may cause thermal runaway and become hot. Especially important. For this reason, it is important how lithium ion secondary batteries can prevent the induction of thermal runaway. Since the present invention prevents the induction of thermal runaway with a unique configuration, it is suitable for a battery pack in which the cylindrical battery 1 is a lithium ion secondary battery.

  When battery temperature of a battery pack suddenly increases due to thermal runaway due to an internal short circuit or overcharge, the adjacent cylindrical battery is heated by the heat generated by the thermal runaway cylindrical battery, and thermal runaway is induced. It has a unique structure that prevents it. An assembled battery that realizes this is a battery unit 2 in which a plurality of cylindrical batteries are arranged in parallel and both end faces are arranged in the same plane and arranged in one or a plurality of battery rows, and the cylindrical battery 1 Radiation fins 4 that are in surface contact and connected in a thermally coupled state, and a heat conduction plate 3 that is coupled to the radiation fins 4 in a thermally coupled state and arranged in a posture extending in the arrangement direction of the cylindrical batteries 1 are provided. . The radiating fins 4 include first radiating fins 41 and second radiating fins 42 that are alternately connected to the cylindrical batteries 1 arranged adjacent to each other, and the first radiating fins 41 and the second radiating fins 42 are provided. The radiating fins 42 are arranged in a non-thermally coupled state. Furthermore, the heat conductive plate 3 includes a first heat conductive plate 31 and a second heat conductive plate 32 that are arranged in a non-thermally coupled state. The first heat radiating fins 41 are connected to the first heat conductive plate 31 without being thermally coupled to the second heat conductive plate 32, and the second heat radiating fins 42 are connected to the first heat conductive plate 31. Without being thermally coupled to the second heat conducting plate 32.

1 to 7, the first heat conductive plate 31 and the second heat conductive plate 32 are arranged on both sides of each battery row and in a plane parallel to a plane including the longitudinal direction of the cylindrical battery 1. It is arranged. The first heat conduction plate 31 and the second heat conduction plate 32 are arranged on both sides of each battery row and are arranged in a non-thermally coupled state. The heat conducting plate 3 has radiating fins 4 connected to the cylindrical battery 1 in a thermally coupled state with the surface thereof. The radiating fins 4 are fitted in the cylindrical battery 1 on the inner side and arranged in a fixed position, and are further thermally coupled to the cylindrical battery 1 in a surface contact state. The radiating fins 4 include first radiating fins 41 and second radiating fins 42 that are alternately connected to the cylindrical battery 1 arranged adjacent to each other. The first radiating fin 41 and the second radiating fin 42 are separated from each other and arranged in a non-thermally coupled state. When the first heat conducting plate and the second heat conducting plate are thermally coupled, the first radiating fin and the second radiating fin connected to the first heat conducting plate and the second heat radiating fin are thermally coupled to each other and arranged adjacent to each other. This is because the battery is thermally coupled to induce thermal runaway. In this assembled battery, the heat generated by the adjacent cylindrical battery 1 is transferred to the first heat conducting plate 31 and the second heat which are in a non-thermally coupled state via the first heat dissipating fins 41 and the second heat dissipating fins 42. Although conducting to the conductive plate 32, the first heat conducting plate 41 and the second heat conducting plate 42 are in a non-thermally coupled state, and thermal runaway is not induced in the adjacent cylindrical battery.
The assembled battery shown in the figure has a first heat conducting plate 31 in which first radiating fins 41 and second radiating fins 42 connected to adjacent cylindrical batteries 1 are alternately arranged on the opposite side of the battery array. Are coupled to the second heat conducting plate 32 by thermal coupling. The first heat conduction plate 31 and the second heat conduction plate 32 arranged on the opposite side of the battery array are in a non-thermally coupled state, and from one heat conduction plate 3 to the other heat conduction plate 3. Does not conduct heat. The first radiating fin 41 and the second radiating fin 42 arranged adjacent to each other are arranged in a non-thermally coupled state with a gap therebetween. The first heat radiation fin 41 and the second heat radiation fin 42 can further improve heat insulation characteristics by providing a heat insulation layer therebetween. The heat insulating layer is formed of insulating plastic and disposed between the heat radiating fins 4. The heat insulating layer made of plastic is also used in the holder in which the heat radiating fins 4 are arranged in a fixed position. The heat insulating layer can reduce the heat conduction between the adjacent radiating fins 4 and can more reliably prevent the thermal runaway of the adjacent cylindrical battery 1. Moreover, since the heat insulation layer can implement | achieve the outstanding heat insulation characteristic, making the adjacent radiation fin 4 approach, it can prevent the induction | guidance | derivation of thermal runaway, making the assembled battery compact.

  In FIG. 1 to FIG. 3, the first heat conduction plate 31 and the second heat conduction plate 32 arranged on the opposite side of the battery unit 2 are arranged in parallel to each other for easy distinction. The plurality of heat conduction plates 3 are alternately indicated by a solid line (first heat conduction plate 31) and a chain line (second heat conduction plate 32). Further, the first heat radiation fin 41 connected to the first heat conduction plate 31 indicated by a solid line is a solid line, and the second heat radiation fin 42 connected to the second heat conduction plate 32 indicated by a chain line is a chain line. The position relationship between the first radiating fins 41 and the second radiating fins 42 connected to the first heat conducting plate 31 and the second heat conducting plate 32 is made easy to understand.

  The assembled battery of FIG. 1 has a plurality of cylindrical batteries 1 arranged in a row to form a battery unit 2. In the figure, a first heat conduction plate 31 and a second heat conduction plate 32 are provided on both upper and lower surfaces of the battery unit 2. Is arranged. The cylindrical battery 1 arranged adjacent to each other includes first and second heat radiation fins 41 and second heat radiation that are connected to first heat conduction plates 31 and second heat conduction plates 32 that are alternately disposed above and below. The heat generated by the adjacent cylindrical battery 1 fitted into the fins 42 in a heat-coupled state is the first heat conduction arranged alternately up and down via the first heat radiation fins 41 and the second heat radiation fins 42. Conducted to the plate 31 and the second heat conducting plate 32. The assembled battery of FIG. 1 is a battery unit in which a cylindrical battery 1 in an even number column (in this specification, an even number column and an odd number column are counted from the left to the right in the figure) via a first radiation fin 41 in the figure. 2 is connected to the first heat conduction plate 31 on the lower surface of 2, and the second row of heat conduction plates 32 arranged on the upper surface of the battery unit 2 through the second heat dissipating fins 42. It is connected. In this assembled battery, heat generated by the even-numbered cylindrical batteries 1 is conducted to the first heat conducting plate 31 on the lower surface, and heat generated from the odd-numbered cylindrical batteries 1 is conducted to the second heat conducting plate 32 on the upper surface. In this assembled battery, the heat generation of the adjacent cylindrical battery 1 is conducted to the first heat conduction plate 31 and the second heat conduction plate 32 that are alternately arranged up and down, and the heat generation of the adjacent cylindrical battery 1 is conducted. It does not conduct to the same heat conduction plate 3, but conducts heat to the heat conduction plates 3 in a non-thermally coupled state to dissipate heat. Therefore, the heat generated by the thermal battery runaway cylindrical battery 1 is not conducted to the adjacent cylindrical battery 1, and the thermal runaway cylindrical battery 1 prevents the thermal runaway caused by heating the adjacent cylindrical battery 1.

  The battery unit 2 of the assembled battery in FIGS. 2 to 4 has a cylindrical battery 1 arranged in a plurality of battery rows. In the assembled battery shown in these figures, the cylindrical batteries 1 of each battery row are arranged in the vertical direction in the figures. Therefore, in these assembled batteries, cylindrical batteries are arranged in a plurality of battery rows, and the cylindrical batteries 1 of each battery row are arranged at intersections of the grid lattice. The assembled battery in FIG. 2 has the cylindrical batteries 1 arranged in two rows, the assembled battery in FIG. 3 has the cylindrical batteries 1 arranged in three rows, and the assembled battery in FIG. 4 has the cylindrical batteries 1 arranged in four rows. ing. In these assembled batteries, the first heat conduction plates 31 and the second heat conduction plates 32 are alternately arranged on both sides of each battery row. An intermediate heat conduction plate 3X is disposed between the battery rows, and an outer heat conduction plate 3Y is disposed on both sides of the battery unit 2. The battery pack of FIG. 2 arranges the first heat conduction plate 31, the second heat conduction plate 32, and the first heat conduction plate 31 in order from the bottom, and the battery pack of FIG. The first heat conduction plate 31, the second heat conduction plate 32, the first heat conduction plate 31, and the second heat conduction plate 32 are arranged, and the assembled battery of FIG. A conductive plate 31, a second heat conductive plate 32, a first heat conductive plate 31, a second heat conductive plate 32, and a first heat conductive plate 31 are arranged. Since the heat conduction plates 3 are arranged on both sides of each battery row, the assembled battery in which the cylindrical batteries are arranged in a plurality of battery rows has the first heat conduction plate 31 and the second heat conduction between each row. The plates 32 are arranged alternately.

  FIG. 5 shows an exploded perspective view of the assembled battery of FIG. In this assembled battery, the first heat conduction plate 31 is an outer heat conduction plate 3Y, and the second heat conduction plate 32 is an intermediate heat conduction plate 3X. The intermediate heat conductive plate 3X, which is the second heat conductive plate 32, has second heat dissipating fins 42 connected to both upper and lower surfaces, and the second heat dissipating fins 42 provided on the upper and lower sides are staggered, that is, on the upper side. The lower second radiation fin 42 is disposed in the middle of the second radiation fin 42, and the upper second radiation fin 42 is disposed in the middle of the lower second radiation fin 42. The second heat dissipating fins 42 provided on the upper and lower sides are arranged at positions connected to the odd-numbered or even-numbered cylindrical batteries 1 of the battery units 2 arranged on the upper and lower sides. 2 and 5, the heat conducting plate 3 </ b> X on the upper surface connects the heat radiation fins 4 on the upper surface to the even-numbered cylindrical batteries 1 and the heat radiation fins 4 on the lower surface to the odd-numbered cylindrical battery 1. The intermediate heat conduction plate 3X does not have the heat radiating fins 4 disposed at the same upper and lower positions. Therefore, the assembled battery including the heat radiation fin 4 can effectively prevent the thermal runaway of the cylindrical battery 1 from being induced by the cylindrical battery 1 directly above and below. This is because the heat generated by the thermal runaway cylindrical battery 1 is conducted to the cylindrical battery 1 disposed on both sides of the cylindrical battery 1 directly above.

  The outer first heat conducting plate 31 disposed on the upper surface and the lower surface of the battery unit 2 is connected to the first heat dissipating fins 41 on one surface. 2 and 5, the first heat conducting plate 31 disposed on the upper surface of the battery unit 2 has the first heat radiating fins 41 connected to the lower surface. The first radiating fins 41 connected to the lower surface are connected to the cylindrical battery 1 arranged between the cylindrical batteries 1 connecting the second radiating fins 42 connected to the intermediate heat conducting plate 3X. Therefore, the 1st heat conduction plate 31 arrange | positioned above the battery unit 2 has connected the 1st radiation fin 41 of the position connected with the cylindrical battery 1 of an odd number row | line | column. This is because the even-numbered cylindrical batteries 1 are connected to the second radiating fins 42 connected to the intermediate heat conducting plate 3X.

  2 and 5, the first heat conducting plate 31 disposed on the lower surface of the battery unit 2 has the first heat radiating fins 41 connected to the upper surface. The first radiating fins 41 connected to the upper surface are connected to the cylindrical battery 1 disposed between the cylindrical batteries 1 to which the second radiating fins 42 connected to the intermediate heat conducting plate 3X are connected. . Therefore, the 1st heat conduction plate 31 arrange | positioned under the battery unit 2 shown in FIG. 5 has connected the 1st radiation fin 41 of the position connected with the cylindrical battery 1 of an even number row. This is because the odd-numbered cylindrical batteries 1 are connected to the second radiation fins 42 connected to the intermediate heat conduction plate 3X.

  In the assembled battery of FIG. 3, the cylindrical batteries 1 are arranged in three rows vertically to form a battery unit 2. In this assembled battery, the first heat conduction plates 31 and the second heat conduction plates 32 are alternately arranged on both sides of the battery unit 2 and between the battery rows. In the assembled battery of this figure, the first heat conduction plates 31 and the second heat conduction plates 32 are alternately arranged in order from the bottom. The assembled battery is arranged as a second heat conductive plate 32, a first heat conductive plate 31, and an intermediate heat conductive plate 3X between three battery rows. The second heat conduction plate 32 arranged in the lower stage and the first heat conduction plate 31 arranged in the upper stage connect the heat dissipating fins 4 on the upper surface to the cylindrical batteries 1 in the even rows, and The radiating fins 4 are connected to the odd-numbered cylindrical batteries 1. The outer heat conductive plate 3Y has the same shape as the assembled battery of FIG. 2 in which the heat radiating fins 4 are connected to one side. The intermediate heat conduction plate 3X and the outer heat conduction plate 3Y are connected to the upper and lower heat conduction plates 3 alternately so that the radiating fins 4 connected to the cylindrical battery 1 arranged directly above and directly below. The radiating fins 4 are arranged in odd and even rows.

  Further, in the assembled battery of FIG. 3, a corrugated heat insulating sheet 5 is disposed between adjacent cylindrical batteries 1. In this assembled battery, as shown in the exploded cross-sectional view of FIG. 6, a heat insulating sheet 5 is arranged between the odd-numbered cylindrical batteries 1 and the even-numbered cylindrical batteries 1 in each battery row. The assembled battery shown in FIG. 3 is between the first heat radiating fins 41 and the second heat radiating fins 42 arranged in the same battery row, and the first heat conducting plate 31 and the second heat conducting plate 32. The heat insulating sheet 5 is disposed between the two. The heat insulating sheet 5 is a flexible sheet material, and is deformed into a wave shape along the surfaces of the first heat radiation fins 41 and the second heat radiation fins 42 and interposed between the adjacent heat radiation fins 4. . In this assembled battery, the corrugated heat insulating sheet 5 disposed between the first heat dissipating fins 41 and the second heat dissipating fins 42 effectively prevents thermal runaway from being induced in the adjacent cylindrical battery 1. it can. That is, this assembled battery has a heat insulating property between the first heat dissipating fins 41 and the second heat dissipating fins 42 which are disposed adjacent to each other with the heat insulating sheet 5 disposed between the adjacent heat dissipating fins 4. To improve more.

  In the assembled battery of FIG. 4, cylindrical batteries 1 are arranged in four battery rows to form a battery unit 2. In this assembled battery, a first heat conduction plate 31 and a second heat conduction plate 32 are arranged between both sides of the battery unit 2 and between each battery row. In the assembled battery, intermediate heat conduction plates 3X are arranged in three rows between four battery rows. The intermediate heat conductive plate 3 </ b> X connects the radiating fins 4 on the upper surface to the even-numbered cylindrical cells 1 and connects the radiating fins 4 on the lower surface to the odd-numbered cylindrical cells 1. The outer heat conductive plate 3Y has the same shape as the assembled battery of FIG. 5 in which the heat radiating fins 4 are connected to one side. The intermediate heat conduction plate 3X and the outer heat conduction plate 3Y have first heat conduction plates 31 in which heat radiation fins 4 connected to the cylindrical batteries 1 arranged above and below are alternately arranged above and below the battery rows. The heat radiating fins 4 are arranged in odd and even rows so as to be connected to the second heat conducting plate 32.

The heat radiating fins 4 have a cylindrical shape into which the cylindrical battery 1 is inserted in a thermally coupled state. The heat dissipating fins 4 can increase the heat coupling area with the cylindrical battery 1 and efficiently conduct the heat generated by the cylindrical battery 1 to the heat dissipating fins 4. As shown in FIG. 7, the radiating fins 4 may be formed in a semi-cylindrical shape that fits the cylindrical battery 1 in a thermally coupled state. The semi-cylindrical radiating fin 4A can be fitted in a state in which the opening width of the opening slit 4a is smaller than the half circumference of the cylindrical battery 1 so that the cylindrical battery 1 cannot be removed. Further, the heat conduction area with the cylindrical battery 1 can be increased.
Further, in the above assembled battery, the first heat conducting plate 31 and the first heat radiating fin 41 are integrally structured, and the second heat conducting plate 32 and the second heat radiating fin 42 are integrally structured. The heat conduction plate 3 is connected. The assembled battery in which the heat conductive plate 3 and the heat radiating fins 4 are integrated with each other can efficiently conduct the heat generated by the cylindrical battery 1 from the heat radiating fins 4 to the heat conductive plate 3, and is inexpensive by drawing aluminum or an aluminum alloy. Has the feature of mass production.

  In the assembled battery of FIGS. 8 and 9, the first heat conductive plate 31 and the second heat conductive plate 32 are arranged in a state where the cylindrical battery 1 is penetrated. The first heat conducting plate 31 and the second heat conducting plate 32 are arranged in a parallel posture in a non-thermally coupled state, separated from each other in a posture parallel to both end faces of the cylindrical battery 1. In the battery pack shown in the figure, two heat conductive plates 3 including a first heat conductive plate 31 and a second heat conductive plate 32 are arranged vertically apart from each other in the axial direction of the cylindrical battery 1. The first heat conductive plate 31 and the second heat conductive plate 32 are connected through holes 3A formed by connecting the radiating fins 4 in a heat-coupled state and non-coupled formed by inserting the radiating fins 4 in a non-heat-coupled state. The through holes 3B are provided alternately. The first heat conducting plate 31 is provided with a connecting through hole 3A for connecting the first radiating fin 41 in a thermally coupled state, and a non-coupled through hole 3B for penetrating the second radiating fin 42 in a non-thermally coupled state. Yes. The second heat conducting plate 32 is provided with a connecting through hole 3A that connects the second radiating fin 42 in a thermally coupled state, and a non-coupled through hole 3B that penetrates the first radiating fin 41 in a non-thermally coupled state. Yes. The connection through-hole 3A of the first heat conduction plate 31 is at a position opposite to the non-bonding through-hole 3B of the second heat conduction plate 32, and the connection through-hole 3A of the second heat conduction plate 32 is the first through-hole 3A. It arrange | positions in the position facing the unbonded through-hole 3B of the heat conductive plate 31. The first heat conduction plate 31 and the second heat conduction plate 32 shown in the figure are provided with a non-coupled through hole 3B next to the coupled through hole 3A and a coupled through hole 3A next to the uncoupled through hole 3B. The connecting through holes 3A and the non-bonding through holes 3B are arranged in a grid pattern, and the cylindrical battery 1 is arranged in a grid pattern. The first heat radiating fin 41 is not thermally coupled to the second heat conducting plate 32 but is thermally coupled to the first heat conducting plate 31, and the second heat radiating fin 42 is coupled to the first heat conducting plate 31. It is thermally coupled to the second heat conducting plate 32 without being thermally coupled. The adjacent cylindrical batteries 1 are arranged so as to be separated from each other by a first heat radiation fin 41 and a second heat radiation fin 42 and are in a non-thermally coupled state with each other. It is connected to either one of the heat conducting plates 32 in a thermally coupled state. That is, the heat generated in the adjacent cylindrical battery 1 is thermally conducted and dissipated to one of the first heat conducting plate 31 and the second heat conducting plate 32 that are arranged apart from each other in a non-thermally coupled state. The 8 and FIG. 9 includes one first heat conducting plate 31 and one second heat conducting plate 32. The assembled battery includes the first heat conducting plate and the second heat conducting plate 32. Three or more heat conductive plates can be arranged in a non-thermally coupled state by alternately separating the heat conductive plates in the axial direction of the cylindrical battery. In this assembled battery, the heat dissipating fins are connected to a plurality of heat conducting plates in a thermally coupled state, and the thermal energy of the cylindrical battery is thermally conducted to the plurality of heat conducting plates to dissipate heat.

  Further, in the above assembled battery, the first heat conducting plate 31 and the first heat radiating fin 41 are integrally structured, and the second heat conducting plate 32 and the second heat radiating fin 42 are integrally structured. The heat conduction plate 3 is connected. The assembled battery in which the heat conducting plate 3 and the heat radiating fins 4 are integrated with each other can efficiently conduct heat from the cylindrical battery 1 from the heat radiating fins 4 to the heat conducting plate 3.

  Since the assembled battery of the present invention can be used safely by preventing the induction of thermal runaway, it can be effectively used as a large-capacity power supply device that uses a large amount of cylindrical battery 1 in various applications that require safety. .

1, 71, 81, 91 ... cylindrical battery 2 ... battery unit 3 ... heat conduction plate
31 ... 1st heat conduction plate 32 ... 2nd heat conduction plate 3A ... Connection through-hole 3B ... Non-bonding through-hole 3X ... Intermediate heat conduction plate 3Y ... Outer heat conduction plate 4 ... Radiation fin 41 ... 1st Radiation fin 42 ... second radiation fin 4A ... radiation fin (semi-cylindrical)
4a ... Opening slit 5 ... Thermal insulation sheet 6 ... Case 72 ... Battery holder 73 ... Holding grooves 77, 87, 97 ... Thermally conductive resin 83 ... Exterior case 90 ... Battery core pack 93 ... Bottom case

Claims (11)

A battery unit in which a plurality of cylindrical batteries are arranged in parallel and both end faces are arranged in the same plane and arranged in one or more battery rows;
Radiating fins that are in surface contact with the cylindrical battery and connected in a thermally coupled state;
A heat conduction plate connected to the heat dissipating fins in a thermally coupled state and arranged in a posture extending in the arrangement direction of the cylindrical batteries,
The radiating fin includes a first radiating fin and a second radiating fin that are alternately connected to the cylindrical battery arranged adjacent to each other,
The first radiating fin and the second radiating fin are arranged in a non-thermally coupled state,
The heat conduction plate includes a first heat conduction plate and a second heat conduction plate which are arranged in a non-thermally coupled state with each other,
The first heat dissipating fin is connected to the first heat conducting plate in a thermally coupled state without being thermally coupled to the second heat conducting plate,
The assembled battery according to claim 1, wherein the second heat dissipating fin is connected to the second heat conducting plate in a thermally coupled state without being thermally coupled to the first heat conducting plate. The assembled battery according to claim 1,
The first heat conduction plate and the second heat conduction plate are arranged on both sides of the battery row in a plane parallel to a plane including the longitudinal direction of the cylindrical battery,
The first radiating fins and the second radiating fins, which are connected in a thermally coupled state to the cylindrical batteries arranged adjacent to each battery row, are arranged on the opposite side of each battery row. An assembled battery characterized by being thermally coupled to the first heat conducting plate and the second heat conducting plate. An assembled battery according to claim 2,
The battery unit has a plurality of cylindrical batteries arranged in a row,
The assembled battery, wherein the cylindrical batteries arranged adjacent to each other are thermally coupled to the first and second radiating fins alternately. An assembled battery according to claim 2,
The battery unit has the cylindrical batteries arranged in a plurality of battery rows;
On both sides of each battery row, the first heat conduction plate and the second heat conduction plate are alternately arranged,
Between each battery row, an intermediate heat conduction plate is arranged, and an outer heat conduction plate is arranged on both sides of the battery unit,
The intermediate heat conduction plate is connected to heat radiation fins on both sides,
The assembled battery, wherein the heat-radiating fin is connected to one side of the outer heat conductive plate. An assembled battery according to any one of claims 2 to 4,
An assembled battery comprising a heat insulating sheet disposed between the first and second heat dissipating fins disposed adjacent to each other. The assembled battery according to claim 1,
The battery unit has a plurality of cylindrical batteries arranged in one or more battery rows,
The first heat conduction plate and the second heat conduction plate are arranged in parallel with each other in a non-thermally coupled state at a position where the cylindrical battery penetrates,
The first heat conducting plate is provided with a connecting through hole that connects the first radiating fin in a thermally coupled state, and a non-coupled through hole that penetrates the second radiating fin in a non-thermally coupled state,
The second heat conducting plate is provided with a connection through hole that connects the second heat dissipating fin in a thermally coupled state, and a non-bonded through hole that allows the first heat dissipating fin to pass through in a non-thermally coupled state,
The connection through hole of the first heat conduction plate is located at a position opposite to the non-bonding through hole of the second heat conduction plate.
The connection through hole of the second heat conduction plate is disposed at a position opposite to the non-bonding through hole of the first heat conduction plate,
The first and second heat conduction plates, in which the adjacent cylindrical batteries are arranged in a non-thermally coupled state with each other via the first heat radiation fin and the second heat radiation fin, A battery pack characterized by being thermally coupled to the battery. The assembled battery according to claim 6,
An assembled battery comprising two heat conduction plates each including a first heat conduction plate and a second heat conduction plate which are arranged apart from each other in a parallel posture. The assembled battery according to claim 7,
An assembled battery comprising three or more heat conduction plates formed by alternately arranging the first heat conduction plates and the second heat conduction plates in a parallel posture. An assembled battery according to any one of claims 1 to 8,
An assembled battery, wherein a heat insulating layer is provided between the adjacent radiating fins. An assembled battery according to any one of claims 1 to 9,
The assembled battery is characterized in that the heat dissipating fin has a cylindrical shape that is in close contact with the entire circumference of the cylindrical battery, or a cylindrical shape that has a slit in the axial direction in contact with a part of the surface of the cylindrical battery in a thermally coupled state. . The assembled battery according to any one of claims 1 to 10,
An assembled battery comprising the heat conducting plate and the heat radiating fin as an integrated structure, wherein the heat radiating fin is connected to the heat conducting plate.

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