JP2012234734A - Cooling device of battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device of a battery which efficiently cools the battery.SOLUTION: A battery 29 is formed by a battery element part 11 and a housing case 12 housing the battery element part 11. A Peltier element 13 serving as a cooler is provided at a gravity direction upper part of the housing case 12, and a container 14 accumulating a liquid F, causing convention flow in a free space of corners in the housing case 12, is provided. Heat generated from the battery element part 11 is radiated and cooled by being transmitted to a heat absorption part 13A of the Peltier element 13 through a winding end part 11A of the battery element part 11 and through an outer peripheral surface 11C of the battery element part 11 and the liquid F.

Description

  The present invention relates to a battery cooling device.

As a prior art of a battery cooling device, for example, a battery cooling device disclosed in Patent Document 1 is disclosed. The battery cooling device disclosed in Patent Document 1 includes each unit cell, a support member supported by the lower end surface of each unit cell, and a cooling means for cooling the support member. The cooling means includes a Peltier element having a heat absorption part that is cooled by applying a voltage, and a power source part that applies a voltage to the Peltier element. A support member of the battery cooling device is a Peltier element. It is an endothermic part. The Peltier element is composed of a heat absorbing part, a heat radiating part spaced from the heat absorbing part, and a joint part between the heat absorbing part and the heat radiating part, with the heat absorbing part on the upper side and the heat radiating part on the lower side. Yes.
In the assembled battery including the battery cooling device having such a configuration, when the temperature of the unit cell rises, a voltage is applied to the Peltier element to cool the heat absorption part. Since the heat absorption part is a support member that supports the lower end surface of each unit cell, each unit cell can be cooled by cooling the support member. The heat transferred from the heat absorbing part to the heat radiating part is radiated to the outside through the lower casing fixed to the heat radiating part.

JP 2010-192207 A

  In the battery cooling device disclosed in Patent Document 1, since the support member that supports the lower end surface of each unit cell is the heat absorption part of the Peltier element that forms part of the cooling means, each unit cell is interposed via the support member. It is possible to cool the lower end surface of. However, since each unit cell can be cooled only through the lower end surface, the cooling efficiency is extremely poor, and there is a problem that a considerable time is required to cool the entire unit cell.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a battery cooling apparatus capable of efficiently cooling a battery.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a battery cooling device, comprising: a battery element portion; and a storage case for storing the battery element portion, wherein the storage case is The storage case is formed in a space between the battery element portion and the storage case including the upper part in the gravity direction of the storage case, and has a refrigerant storage chamber for storing fluid refrigerant, and at least the upper part in the gravity direction of the storage case And a cooler for cooling the fluid refrigerant.

  According to the first aspect of the present invention, the refrigerant storage chamber for storing the fluid refrigerant is formed in the space between the battery element part in the storage case and the storage case including the upper part in the gravity direction of the storage case. Since a cooler that cools the fluid refrigerant is provided at least in the upper part in the direction of gravity, the heat generated in the battery element part is received by the fluid refrigerant by using the convection of the fluid refrigerant, and is radiated to the cooler via the fluid refrigerant. It is possible to make it. Moreover, since the cooler is provided at least in the upper part in the gravity direction of the storage case, the heat generated in the battery element portion can be directly cooled by the cooler. Therefore, in addition to direct cooling by the cooler, cooling using convection of the fluid refrigerant can be utilized, and the battery can be efficiently cooled.

  According to a second aspect of the present invention, in the battery cooling device according to the first aspect, the cooler is provided only in an upper part in the gravity direction of the storage case.

  According to the second aspect of the present invention, since the cooler is provided only in the upper part of the storage case in the gravity direction, the apparatus can be prevented from being enlarged and simplified.

  According to a third aspect of the present invention, in the battery cooling device according to the first or second aspect, the fluid refrigerant is a liquid in a temperature change range of the fluid refrigerant during operation of the battery.

  According to the third aspect of the present invention, it is possible to transfer the heat generated in the battery to the cooler using liquid convection to cool the battery.

  According to a fourth aspect of the present invention, in the battery cooling device according to the first or second aspect, the fluid refrigerant is a boiling cooling refrigerant.

  According to the fourth aspect of the present invention, it is possible to cool the battery by transferring the heat generated in the battery to the cooler by utilizing the vaporization and liquefaction of the boiling cooling refrigerant. Boiling cooling refers to a cooling system in which heat is exchanged between a high temperature body and a low temperature body by boiling heat transfer of the refrigerant.

  According to a fifth aspect of the present invention, in the battery cooling device according to any one of the first to fourth aspects, the cooler includes a Peltier element.

  According to the fifth aspect of the present invention, by applying electric power to the Peltier element, the heat generated in the battery can be absorbed by the heat absorbing part and can be thermally transferred to the heat radiating part to be radiated.

  A sixth aspect of the present invention is the battery cooling device according to any one of the first to fifth aspects, wherein an electrode connected to the battery element portion protrudes from a lower part in the gravitational direction of the storage case. Features.

  According to invention of Claim 6, interference with the cooler and electrode which are arrange | positioned at the gravity direction upper part of a storage case can be avoided.

  The invention according to claim 7 is the battery cooling device according to any one of claims 1 to 6, wherein the fluid refrigerant is made of an insulating material.

  According to the seventh aspect of the invention, the fluid refrigerant may be stored in the refrigerant storage chamber so as to directly touch the battery element portion.

  According to an eighth aspect of the present invention, in the battery cooling device according to any one of the first to seventh aspects, the refrigerant storage chamber is formed of a container.

  According to the eighth aspect of the present invention, it is sufficient to store the fluid refrigerant in the container, and the handling is simple.

  According to the present invention, in addition to direct cooling by a cooler, cooling using convection of a fluid refrigerant can be used, and the battery can be efficiently cooled.

It is a disassembled perspective view which shows the whole structure of the cooling device which concerns on 1st Embodiment. It is a front view of the cooling device concerning a 1st embodiment. It is the sectional view on the AA line in FIG. It is an expansion schematic diagram of the Peltier device concerning a 1st embodiment. 1 is a system diagram of a cooling device according to a first embodiment. It is a mimetic diagram for explanation of operation of the cooling device concerning a 1st embodiment. It is a disassembled perspective view which shows the whole structure of the cooling device which concerns on 2nd Embodiment. It is a system diagram of the cooling device concerning a 2nd embodiment. It is a system diagram of a cooling device according to a third embodiment.

(First embodiment)
Hereinafter, the cooling device according to the first embodiment will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the battery 29 includes a battery element portion 11 formed by being wound in a spiral shape, and a rectangular parallelepiped storage case 12 for storing the battery element portion 11. The cooling device 10 for the battery 29 includes a Peltier element 13 constituting a part of a cooler provided in the upper part of the storage case 12 in the gravitational direction, and the upper part of the battery case 11 and the storage case 12 in the gravitational direction in the storage case 12 And a container 14 corresponding to a refrigerant storage chamber that stores liquid F as a fluid refrigerant. In FIG. 1, the vertical direction in the drawing is the vertical direction of the cooling device 10, the one arrow in FIG. 1 indicates the horizontal direction of the cooling device 10, and the one arrow indicates the front-back direction of the cooling device 10.

  The battery 29 is a sheet-type secondary battery, in which a rectangular long battery sheet in which a sheet-like positive electrode material and a sheet-like negative electrode material are stacked via a separator containing an electrolyte material is wound in a spiral shape. Is formed. The positive electrode material is formed, for example, by coating a positive electrode active material on a substrate such as aluminum, and the negative electrode material is formed by coating a negative electrode active material on a substrate such as copper. Here, the winding end portion of the battery element portion 11 in a spiral shape of the battery sheet is defined as 11A and 11B, and the outer peripheral surface having an oval cross section is defined as 11C. As shown in FIG. 2, the positive electrode material and the negative electrode material are arranged so as to extend to one of the winding end portions 11A and 11B (11B in this embodiment), and the positive and negative electrode portions 15 and 16 are respectively arranged. Forming. The electrode parts 15 and 16 are connection terminals for connecting to the battery element part 11 and inputting / outputting power (charging and discharging the battery 29).

  The storage case 12 is made of a metal material. The storage case 12 includes a casing portion 19 that is formed in a bottomed rectangular tube shape and has an opening 19A at the top, and a lid portion 20 that closes the opening 19A. A through hole (not shown) for projecting the electrode parts 15 and 16 out of the storage case 12 is formed in the bottom plate part 19B formed below the housing part 19. The storage case 12 is disposed with the opening 19A of the housing 19 facing upward and the bottom plate 19B facing downward.

  The battery 29 is formed by being housed in the storage case 12 with the winding end portion 11A of the battery element portion 11 facing upward and the winding end portion 11B on which the electrode portions 15 and 16 are formed facing downward. ing. The winding end portion 11B of the battery element portion 11 is placed on the bottom plate portion 19B, and the electrode portions 15 and 16 protrude out of the case through the through holes formed in the bottom plate portion 19B. The winding end portion 11 </ b> A of the battery element portion 11 is disposed at a position facing the opening portion 19 </ b> A of the housing portion 19. After the battery element portion 11 is stored in the storage case 12, the lid portion 20 is disposed and fixed so as to close the opening portion 19A. At this time, the lower surface of the lid portion 20 and the winding end portion 11A of the battery element portion 11 are in contact with each other. An insulating film is formed on the entire inner surface of the casing 19 and the lower surface of the lid 20.

The Peltier element 13 includes a plate-like heat absorbing portion 13A, a plate-like heat radiating portion 13B, and a connecting portion 13C interposed between the heat absorbing portion 13A and the heat radiating portion 13B and alternately connecting P-type semiconductors and N-type semiconductors. It is composed of The heat absorbing portion 13A and the heat radiating portion 13B are made of a ceramic material such as aluminum nitride having a high thermal conductivity and excellent electrical insulation. The Peltier element 13 is arranged and fixed so that the heat absorption part 13A and the cover part 20 are in contact with the heat absorption part 13A on the lower side and the heat radiation part 13B on the upper side.
As shown in FIG. 1, lead electrodes 17 and 18 protrude laterally from the Peltier element 13. In addition, a plurality of fins 13D are erected on the heat dissipation part 13B, and the fins 13D promote heat dissipation from the heat dissipation part 13B.

  As shown in FIG. 4, one joining surface of the P-type semiconductor 21 and the N-type semiconductor 22 in the connecting portion 13 </ b> C is joined to the heat absorbing portion 13 </ b> A via the conductive member 23. Further, the other joint surfaces of the P-type semiconductor 21 and the N-type semiconductor 22 are joined to the heat radiating portion 13 </ b> B via the conductive member 24. Thus, the plurality of P-type semiconductors 21 and the plurality of N-type semiconductors 22 are connected in series by the plurality of conductive members 23 and 24. A direct current power source 25 is connected between the lead electrodes 17 and 18 so that the lead electrode 17 side becomes a positive electrode and the lead electrode 18 side becomes a negative electrode. By connecting in this manner, an endothermic phenomenon occurs at the N → P junction (on the heat absorbing portion 13A side), and a heat dissipation phenomenon occurs at the P → N junction portion (on the heat radiating portion 13B side). That is, by applying DC power from the power source 25 between the lead electrodes 17 and 18, the heat absorbed by the heat absorbing portion 13A can be moved to the heat radiating portion 13B.

  As shown in FIGS. 1 and 3, the container 14 is provided in four empty spaces between the four corners in the storage case 12 and the outer peripheral surface 11C of the battery element portion 11, and has a cylindrical shape with a substantially triangular cross section. It is a container. The length of the container 14 in the vertical direction is formed substantially equal to the length of the battery element portion 11 in the vertical direction. The container 14 is sealed, and the non-conductive liquid F is stored in the container 14. The liquid F is in a liquid state in the temperature change range of the liquid F during operation of the battery 29. As the liquid F, for example, water or coolant can be used. The container 14 is made of, for example, a metal material having excellent thermal conductivity. The container 14 is placed on the bottom plate part 19 </ b> B, and the upper surface of the container 14 is arranged in contact with the lower surface of the heat absorbing part 13 </ b> A of the Peltier element 13.

  As shown in FIG. 5, the cooling device 10 includes a detection sensor 26 for detecting the temperature of the battery 29 arranged in the storage case 12, and a power supply 25 to the Peltier element 13 based on a detection signal from the detection sensor 26. And a control unit 27 that controls application of power from. For example, when the electrode portions 15 and 16 of the battery 29 are connected to a load 28 such as a motor, a current flows through the battery element portion 11. The battery element 11 generates heat due to internal heat generation due to this current, and the temperature rises. The detection sensor 26 monitors the temperature of the battery 29 and transmits the detection signal to the control unit 27. In the control unit 27, a determination process is performed to determine whether or not the temperature Ts detected by the detection sensor 26 has become higher than a predetermined set temperature Tm. When it is determined that Ts is higher than Tm (Ts ≧ Tm), the control unit 27 controls the Peltier element 13 to apply power from the power supply 25.

The cooling device 10 having the above configuration will be described with reference to FIG. FIG. 6 schematically shows the configuration of the cooling device 10.
First, it is assumed that the electrode parts 15 and 16 of the battery 29 are connected to the load 28 and are supplied with power (discharge of the battery 29). The battery 29 generates heat internally due to the flowing current, and the temperature of the battery 29 rises due to this heat generation. When the temperature Ts detected by the detection sensor 26 is higher than the set temperature Tm (Ts ≧ Tm), the control unit 27 controls the Peltier element 13 to apply power from the power source 25. When DC power is applied from the power source 25 between the lead electrodes 17 and 18 of the Peltier element 13, a current flows through the Peltier element 13, and the heat absorbed by the heat absorbing part 13A is moved to the heat radiating part 13B.

  By the way, since the winding end portion 11A of the battery element portion 11 and the lower surface of the lid portion 20 are in contact with each other and the lower surface of the heat absorbing portion 13A is in contact with the lid portion 20, the arrows in FIG. As shown, the heat generated in the battery element portion 11 is conducted to the heat absorbing portion 13A. In particular, since the battery element portion 11 is formed by winding a metal positive electrode material and a negative electrode material via a separator, the heat generated in the battery element portion 11 is transferred along the positive electrode material and the negative electrode material. The heat is efficiently transmitted to the upper heat absorbing portion 13A, and the battery 29 is cooled.

Further, in the containers 14 provided at four places, as shown by arrows in FIG. 6, the heat generated in the battery element portion 11 is transferred to the liquid F in the container 14 via the outer peripheral surface 11 </ b> C of the battery element portion 11. Conducted by When heat is transmitted to the liquid F (heat reception), the liquid F is warmed, the density is lowered, and the inside of the container 14 is moved upward. The liquid F that has moved upward comes into contact with the heat absorbing portion 13A of the Peltier element 13 through the wall of the container 14, and the heat of the liquid F is conducted (radiated) to the heat absorbing portion 13A. When the heat is conducted to the heat absorbing part 13A, the temperature of the liquid F is lowered and the density is increased, and the liquid 14 moves downward in the container 14. As a result, as indicated by an arrow (dashed line) in FIG. 6, convection of the liquid F occurs in the container 14, and the heat generated in the battery element portion 11 passes through the liquid F to the heat absorbing portion 13A of the Peltier element 13. Conducted by
The four corner portions in the storage case 12 have good clearance between the outer peripheral surface 11C of the battery element portion 11 and the housing portion 19 of the storage case 12, so that the heat conduction of the heat generated in the battery element portion 11 is good. Absent. However, by disposing the container 14 in the empty space at this corner and storing the liquid F therein, the heat generated in the battery element portion 11 is transmitted to the heat absorbing portion 13A of the Peltier element 13 using the convection of the liquid F. The battery element part 11 can be cooled.

  Thus, the heat generated in the battery element portion 11 is conducted to the heat absorbing portion 13A of the Peltier element 13 via the winding end portion 11A of the battery element portion 11, and the outer peripheral surface 11C of the battery element portion 11 Heat is dissipated by being conducted to the heat absorbing portion 13A of the Peltier element 13 via the liquid F. In addition, since the storage case 12 is formed of a metal material having excellent thermal conductivity, the heat generated in the battery element portion 11 is absorbed by the heat absorbing portion 13A of the Peltier element 13 via the housing portion 19 of the storage case 12. It is also possible to dissipate heat by being conducted to.

The heat absorbed by the heat absorbing portion 13A is moved to the heat radiating portion 13B, but the heat is efficiently dissipated to the outside by the fins 13D provided in the heat radiating portion 13B.
When the battery 29 is cooled and the temperature Ts detected by the detection sensor 26 becomes lower than the set temperature Tm (Ts <Tm), the control unit 27 applies power from the power source 25 to the Peltier element 13. Control to shut off. As a result, no current flows through the Peltier element 13, and the heat transfer from the heat absorbing portion 13A to the heat radiating portion 13B is stopped.

The cooling device 10 according to the first embodiment has the following effects.
(1) Since the Peltier element 13 is provided in the upper part of the storage case 12 in the gravitational direction, the heat generated in the battery element 11 is absorbed by the Peltier element 13 via the winding end 11A of the battery element 11. It is conducted to the part 13A and can be radiated to the outside through the heat radiating part 13B. Further, by arranging the containers 14 at the four corners in the storage case 12 and storing the liquid F therein, the heat generated in the battery element portion 11 using the convection of the liquid F is absorbed into the heat absorbing portion 13A of the Peltier element 13. It is possible to cool the battery element portion 11. Therefore, in addition to direct cooling of the battery element portion 11 by the Peltier element 13, indirect cooling of the battery element portion 11 using the convection of the liquid F can be utilized, and the battery 29 can be efficiently cooled. Is possible.
(2) Since the Peltier element 13 is provided only in the upper part of the storage case 12 in the gravitational direction, the size of the cooling device 10 can be prevented and the device can be simplified.
(3) By applying electric power to the Peltier element 13, the heat generated in the battery 29 can be absorbed by the heat absorbing part 13A and moved to the heat radiating part 13B to be dissipated.
(4) Since the container 14 is provided in four empty spaces in the storage case 12, the empty space can be used effectively, and the size of the apparatus can be increased without requiring extra space for installing the container 14. Can be prevented.
(5) Since the electrode portions 15 and 16 of the battery 29 protrude outside the case through the through holes formed in the bottom plate portion 19B of the storage case 12 (project from the lower part in the gravity direction of the storage case 12). Interference with the Peltier element 13 disposed in the upper part of the storage case 12 in the gravity direction can be avoided.

(Second Embodiment)
Next, the battery cooling device 30 according to the second embodiment will be described with reference to FIGS.
In this embodiment, the Peltier element 13 in the first embodiment is also provided in the lower part of the storage case 12 in the gravitational direction, and the electrode parts 15 and 16 of the battery 29 are protruded in the upper part of the storage case 12 in the gravitational direction. Other configurations are common.
Therefore, here, for convenience of explanation, some of the reference numerals used in the previous explanation are used in common, explanation of common configurations is omitted, and only the changed parts are explained.

  As shown in FIG. 7, the battery 49 of the present embodiment is formed of a battery element part 31 and a storage case 12 that houses the battery element part 31, and the battery element part 31 has an electrode connected to the battery element part 31. The portions 32 and 33 are provided so as to protrude outward from the upper winding end portion 31A. The battery 49 is formed by being housed in the housing case 12 with the winding end 31A of the battery element 31 in which the electrode portions 32 and 33 are extended facing upward and the winding end 31B facing downward. Has been. Accordingly, no through hole is formed in the bottom plate portion 19B of the storage case 12. Through holes 47 and 48 are formed in the lid portion 46 disposed so as to close the opening portion 19 </ b> A of the storage case 12 in order to avoid interference with the electrode portions 32 and 33. The cooling device 30 for the battery 49 includes a Peltier element 34 provided in the upper part of the storage case 12, a Peltier element 39 provided in the lower part of the storage case 12, and a liquid F as a fluid refrigerant disposed in the storage case 12. And a container 14 for storing the. In this embodiment, the Peltier element 34 is used for cooling the battery 49, and the Peltier element 39 is used for warming up the battery 49.

  The Peltier element 34 arranged at the upper part is composed of a flat plate-like heat absorbing portion 34A, a flat plate-like heat radiating portion 34B, and a connecting portion 34C interposed between the heat absorbing portion 34A and the heat radiating portion 34B. The basic configuration 34 is the same as that of the Peltier element 13 in the first embodiment. Two through holes 35 and 36 are formed at the center of the Peltier element 34 in order to avoid interference with the electrode portions 32 and 33. Further, lead electrodes 37 and 38 protrude laterally from the Peltier element 34, and a plurality of fins 34D are erected on the heat radiating portion 34B. Note that the fin 34D is cut out at portions located on the through holes 35 and 36 in order to avoid interference with the electrode portions 32 and 33.

The Peltier element 34 is arranged and fixed so that the heat absorption part 34A and the lid part 46 are in contact with the heat absorption part 34A on the lower side and the heat radiation part 34B on the upper side. Electrode portions 32 and 33 protrude upward from through holes 35 and 36 formed in the Peltier element 34.
As shown in FIG. 8, a power supply 42 is connected between the lead electrodes 37 and 38, and the lead electrode 37 side is connected to be a positive electrode and the lead electrode 38 side is connected to a negative electrode.

  The Peltier element 39 arranged in the lower part is composed of a flat plate heat absorbing portion 39A, a flat plate heat radiating portion 39B, and a connecting portion 39C interposed between the heat absorbing portion 39A and the heat radiating portion 39B. The basic configuration of 39 is equivalent to the Peltier element 13 in the first embodiment. The Peltier element 39 is arranged and fixed so that the heat-absorbing part 39A is on the lower side and the heat-radiating part 39B is on the upper side, and the heat-radiating part 39B and the bottom plate part 19B of the housing part 19 are in contact with each other. The Peltier element 39 is installed for warming up the battery 49, and is arranged in the same direction as the cooling Peltier element 34 installed at the upper part (the upper part is a heat absorbing part and the lower part is a heat radiating part). Further, lead electrodes 40 and 41 protrude laterally from the Peltier element 39. As shown in FIG. 8, a power supply 43 is connected between the lead electrodes 40 and 41, and the lead electrode 40 side is connected as a positive electrode and the lead electrode 41 side is connected as a negative electrode.

  As shown in FIG. 8, the cooling device 30 includes a detection sensor 26 for detecting the temperature of the battery 49 arranged in the storage case 12 and a detection signal from the detection sensor 26 to the Peltier elements 34 and 39. And a control unit 44 that controls application of power from the power sources 42 and 43. The electrode parts 32 and 33 of the battery 49 are connected to a load 45 such as a motor, for example, so that a current flows through the battery element part 31. The battery element portion 31 generates heat due to internal heat generation due to this current, and the temperature rises. The detection sensor 26 monitors the temperature of the battery 49 and transmits the detection signal to the control unit 44. In the control unit 44, a process for determining whether or not the temperature Ts detected by the detection sensor 26 has become higher than a predetermined upper limit temperature Tmax is performed. When it is determined that the temperature Ts is higher than the upper limit temperature Tmax (Ts> Tmax), the control unit 44 controls the Peltier element 34 to apply power from the power source 42 to cool the battery 49. When it is determined that the battery 49 has been cooled and the temperature Ts detected by the detection sensor 26 has dropped below the upper limit temperature Tmax (Ts <Tmax), the control unit 44 receives power from the power supply 42 to the Peltier element 34. Control to cut off the power application. As a result, no current flows through the Peltier element 34, and the heat transfer from the heat absorbing part 34A to the heat radiating part 34B is stopped.

  On the other hand, when the battery 49 is operated under low temperature conditions, the battery 49 may need to be warmed up. In such a case, the control unit 44 determines whether the temperature Ts detected by the detection sensor 26 has become lower than a predetermined lower limit temperature Tmin. When it is determined that the temperature Ts has become lower than the lower limit temperature Tmin (Ts <Tmin), the control unit 44 controls the Peltier element 39 to apply power from the power source 43 to warm up the battery 49. In the Peltier element 39, when a current flows in the direction shown in FIG. 8, heat transfer occurs from the heat absorbing portion 39A to the heat radiating portion 39B, and the temperature of the battery 49 rises due to this heat. When the battery 49 is warmed up and it is determined that the temperature Ts detected by the detection sensor 26 has risen above the lower limit temperature Tmin (Ts> Tmin), the control unit 44 supplies the power source 43 to the Peltier element 39. Control is made so that the power application from is cut off. As a result, no current flows through the Peltier element 39, and the heat transfer from the heat absorbing portion 39A to the heat radiating portion 39B is stopped.

Thus, in the second embodiment, two through holes 35, 36 are formed in the center of the Peltier element 34 in order to avoid interference with the electrode parts 32, 33. 36, the electrode portions 32 and 33 of the battery 49 can be protruded upward.
Further, since the Peltier element 34 arranged at the upper part of the storage case 12 can be used for cooling the battery 49 and the Peltier element 39 arranged at the lower part of the storage case 12 can be used for warming up the battery 49, the battery 49 Usability can be improved.
Other functions and effects are the same as (1) and (4) in the first embodiment, and a description thereof will be omitted.

(Third embodiment)
Next, a battery cooling device 50 according to a third embodiment will be described with reference to FIG.
In this embodiment, the electrode portions 32 and 33 of the battery 49 in the second embodiment are protruded from the side of the storage case 12, and other configurations are common.
Therefore, here, for convenience of explanation, some of the reference numerals used in the previous explanation are used in common, explanation of common configurations is omitted, and only the changed parts are explained.

As shown in FIG. 9, the battery 51 of the present embodiment is formed such that the electrode portions 53 and 54 extend in the left and right directions from the winding end portion 52 </ b> A above the battery element portion 52. 54 is arranged to project outward from the left and right sides of the storage case 12. Further, notches 55 and 56 are formed in the housing part 19 of the storage case 12 in order to avoid interference with the electrode parts 53 and 54. The battery 51 is formed by storing the battery element part 52 in which the electrode parts 53 and 54 protrude in the storage case 12 with the winding end 52A facing upward and the winding end 52B facing downward. Yes.
Other configurations are the same as those of the second embodiment, and a description thereof will be omitted.

In the third embodiment, since the electrode portions 53 and 54 of the battery 51 can be protruded from the side of the storage case 12, a through-hole is formed in the Peltier element 34 arranged at the upper portion as in the second embodiment. There is no need to provide 35 and 36, the number of manufacturing steps can be reduced, and connection with adjacent batteries is simplified.
Other functions and effects are the same as those of the second embodiment, and a description thereof will be omitted.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit of the invention. For example, the following modifications may be made.
In the first to third embodiments, the fluid stored in the container has been described as the liquid F. However, a boiling cooling refrigerant may be used. Boiling cooling using the boiling cooling refrigerant is performed as follows. The refrigerant that receives heat from the battery boils in the container and becomes refrigerant vapor. When this refrigerant evaporates, it absorbs latent heat. The refrigerant vapor moves upward in the container and is cooled by being brought into contact with the heat absorbing portion of the Peltier element to become a liquid refrigerant. When liquefying here, the latent heat of evaporation is dissipated. The liquid refrigerant moves downward due to the action of gravity, and this process is repeated, whereby the boiling refrigerant convects in the container and the battery can be cooled. As the boiling cooling refrigerant, for example, a fluorocarbon refrigerant, an alcohol refrigerant, or the like can be used. The fluid refrigerant may be a gas. As the gas, for example, a fluorocarbon refrigerant gas or the like can be used.
In the first to third embodiments, it has been described that the container 14 is provided in the refrigerant storage chamber formed in the space between the battery element portion 11 and the storage case 12 in the storage case 12, but the fluid refrigerant is insulated. In the case of being made of a conductive material, the container 14 may not be provided, and the fluid refrigerant may be stored in the refrigerant storage chamber so as to directly touch the battery element portion.
In the first to third embodiments, a part of the cooler has been described as a Peltier element. However, a thermoelectric conversion element other than a Peltier element may be used, and other air-cooled and refrigerant-type coolers may be used. It may be used.
In the first to third embodiments, it has been described that one battery element unit is stored in the storage case, but a plurality of battery element units may be stored.
In the first to third embodiments, it is assumed that the cover parts 20 and 46 that cover the opening 19A of the housing part 19 of the storage case 12 are provided, and the heat absorption part of the Peltier element is disposed on the cover parts 20 and 46. However, the heat absorption part of the Peltier element may be arranged so as to directly cover the opening without providing a cover part.

10, 30, 50 Cooling device 29, 49 Battery 11, 31 Battery element part 11A, 31A Winding end part 12 Storage case 13, 34 Peltier element 13A, 34A Heat absorption part 13B, 34B Heat radiation part 14 Container 15, 32 Electrode part ( Positive)
16, 33 Electrode part (negative)
17, 37 Lead electrode (positive)
18, 38 Lead electrode (negative)
F liquid

Claims (8)

A battery element,
A storage case for storing the battery element portion;
The storage case is formed in a space between the battery element portion in the storage case and the storage case including the upper part in the gravitational direction of the storage case, and has a refrigerant storage chamber for storing a fluid refrigerant,
A battery cooling device comprising a cooler that cools the fluid refrigerant at least in an upper part of the storage case in the direction of gravity.   The battery cooling device according to claim 1, wherein the cooler is provided only in an upper part of the storage case in the gravity direction.   The battery cooling device according to claim 1, wherein the fluid refrigerant is a liquid in a temperature change range of the fluid refrigerant during operation of the battery.   The battery cooling device according to claim 1, wherein the fluid refrigerant is a boiling cooling refrigerant.   The said cooling device is provided with a Peltier device, The battery cooling device as described in any one of Claims 1-4 characterized by the above-mentioned.   The battery cooling device according to any one of claims 1 to 5, wherein an electrode connected to the battery element part protrudes from a lower part in a gravitational direction of the storage case.   The battery cooling apparatus according to claim 1, wherein the fluid refrigerant is made of an insulating material.   The battery cooling device according to any one of claims 1 to 7, wherein the refrigerant storage chamber is formed of a container.

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