JP2016021278A - Backpack power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backpack power source which enables efficient heat radiation.SOLUTION: A backpack power source includes: a secondary battery cell; a case which stores the secondary battery cell; and a backpack part coupled to the case. The case includes: a back contact wall part facing the backpack part; and an outer wall part which is other than the back contact wall part. The case includes a heat flow path, which moves heat occurring from the secondary battery cell or an internal circuit to an exterior part of the case, therein.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a back-fed power source that is equipped with a secondary battery and supplies electric power to a power tool.

  Conventionally, in an electric tool powered by a motor or the like, not only a tool used by connecting an AC commercial power source or a DC constant voltage power source, but also an electric tool capable of mounting a secondary battery has been widely used. Yes. In power tools using secondary batteries, so-called cordless power tools, the demand for larger battery capacities is increasing due to the expansion of the types and applications of power tools. Only battery packs that are directly attached to the tool body In addition, a battery holster that houses a secondary battery and can be worn on the waist is known (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 7-3983

  However, the battery holster that can be worn on the operator's waist has a limit on the number of secondary batteries that can be worn, and the portable power source for power tools and the like has a larger capacity than the battery holster, such as the backpack type. There is a demand for commercial power supplies.

  In this case, a large number of secondary batteries (for example, lithium ion secondary batteries) are arranged and accommodated in a high-capacity power source such as a backpack type. Secondary batteries generally have a large number of secondary batteries because the temperature rises during charging or discharging, and in a back-loaded power source that can be used for a high output or for a long time, improvement of user comfort, From the viewpoint of extending the life of components constituting the power source such as secondary battery cells, it was necessary to efficiently dissipate heat from the secondary battery.

  In view of such circumstances, the present invention intends to provide a back-type power source that efficiently dissipates heat.

  In order to solve the above-described problems, the present invention includes a secondary battery cell, a case that houses the secondary battery cell, and a backpack that is coupled to the case, the case facing the backpack. A heat flow path that moves heat generated from the secondary battery cell or internal circuit to the outside of the case. A backpack type power supply with

  According to said structure, the heat which generate | occur | produced from the battery cell or the internal circuit through the heat flow path can be efficiently moved to the exterior of a case.

  Moreover, it is preferable that the said heat flow path is further equipped with the exhaust heat means to exhaust the heat which generate | occur | produced inside the said case to the exterior of the said case. Moreover, it is preferable that the said front heat exhausting means is provided in the said outer wall part. The heat flow path preferably has a circulation structure inside the case. In the heat flow path, the medium for transferring heat is preferably air or a chemically inert gas. According to such a configuration, the heat generated in the secondary battery can be exhausted to the outside of the case more efficiently.

  Preferably, the case further includes a blowing unit, and the blowing unit moves heat generated inside the case to the exhaust heat unit via the heat flow path. According to such a configuration, the movement of heat can be actively promoted by the blowing means.

  It is preferable that the heat channel has a cylindrical structure with a closed space inside the case, and the medium that moves heat on the heat channel is a liquid. On the heat flow path, the medium for transferring heat is preferably water or a liquid mainly composed of ethylene glycol. According to such a configuration, since heat can be moved by the liquid, heat can be transferred more effectively.

  Preferably, the case further includes a liquid transport unit, and the liquid transport unit is provided on the heat flow path and transports the medium for moving the heat.

  It is preferable that the heat flow path has a cylindrical structure with a closed space inside the case, the cylindrical structure has a refrigerant inside, and the cylindrical structure compresses the refrigerant in a part of the section. . Furthermore, it is preferable that the heat flow path has a compressor, and the cylindrical structure compresses the refrigerant by the compressor. According to the said structure, a heat transfer can be performed more effectively using the vaporization and condensation of a refrigerant | coolant.

The heat flow path is preferably made of a metal material, a carbon material, or a highly heat conductive material reflecting these heat conduction characteristics, and preferably a material mainly composed of these materials. Furthermore, it is preferable that a Peltier effect element is disposed on the heat flow path or as a part constituting the heat flow path. According to such a configuration, not only can heat be transferred effectively, but also the space inside the case can be used efficiently and the apparatus can be made more compact. .
The exhaust heat means preferably includes a heat radiating member made of a material having a higher thermal conductivity than the case outer wall. The exhaust heat means preferably has a heat radiating member having a structure in which the surface area per projected unit area on the inside of the case or the surface in contact with the gas outside the case is wider than that of the outer wall portion of the case. The filling structure is more preferably a bellows shape or a fin structure. The exhaust heat means preferably has an exhaust hole that penetrates the outer wall of the case. According to such exhaust heat means, heat can be transferred more efficiently.

    According to the back-type power source of the present invention, according to the above configuration, the heat generated inside the power source such as the battery cell or the circuit board through the heat flow path can be efficiently transferred to the outside of the case. Therefore, the user can work comfortably without feeling heat.

The perspective view which shows the external appearance of the backpack type power supply of this Embodiment. The side sectional view of the backpack type power supply of this embodiment. The sectional side view of the backpack type power supply of a modification. The sectional side view of the backpack type power supply of a modification. The sectional side view of the backpack type power supply of a modification. The sectional side view of the backpack type power supply of a modification. The sectional side view which shows the detail of the exhaust part of a modification. The sectional side view of the backpack type power supply of a modification. The sectional side view of the backpack type power supply of a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 exemplifies an overview of a backpack type power supply according to this embodiment, and a detailed configuration is omitted.

  As shown in FIG. 1, the backpack-type power source 1 according to the present embodiment is connected via a cable in a state of carrying a case portion 12 housing a plurality of battery cells 10 (FIG. 2) housed therein. Electric power is supplied to power tools (including small agricultural implements). In the present embodiment, as illustrated in FIG. 1, the power cable 16 connected to the lower part of the back load type power source and the tool 17 (not shown) are connected via the adapter 17. As shown in FIG. 2, the backpack type power source 1 includes a case portion 12 having a box shape, a backpack portion 13, a power cable 16, and an adapter 17. In FIG. 2, the back battery 1 is connected to the electric tool 20. FIG. 2 shows a side sectional view of the case portion 12 in order to show the internal structure of the case portion 12.

  The case portion 12 includes a backrest wall 31 located on the back side of the user, an outer wall 32 facing the backrest wall 31 with the battery cell 10 interposed therebetween, an upper wall 33, a bottom wall 34, and a pair of side walls 35 ( 1). The backpack power source 1 of the present embodiment is also assumed to be used in outdoor rain. Therefore, in order to prevent rainwater from entering into the power source 1, the case portion 12 is ideally a completely sealed structure, and preferably has a structure that does not have an opening at least at a site where rainwater hits during use. In such a case, it is preferable to use a structure in which rainwater hardly enters. The thickness of at least one of the outer wall 32, the upper wall 33, and the side wall 35 is a member that can sufficiently conduct heat by being formed thinner than the thickness of the back wall 31, for example. A battery cell 10 made of a secondary battery and a protective substrate 15 are accommodated in the case portion 12. The case portion 12 is made of, for example, resin, and separates the battery cell 10 and the protective substrate 15 from the outside. A heat insulating material 14 is provided on the back wall 31 of the case 12. The heat insulating material 14 is made of, for example, a foamable material such as urethane foam or a fiber heat insulating material such as glass wool. In addition, it is good also as a structure which replaces with the heat insulating material 14, and provides the heat insulation part which consists of hollow structures, and is made into the structure which made the case thickness of the back wall 31 sufficiently thicker than the outer wall 32 grade | etc., And reduced thermal conductivity. Also good. The battery cell 10 is fixed to a frame 51 provided inside the case portion 12. A through hole 51 a is provided in the upper and lower portions of the frame 51.

  In the present embodiment, the size of the heat insulating material 14 in the vertical and horizontal directions is larger than the size in the vertical and horizontal directions of the region where the battery cells 10 are arranged. Thereby, the heat generated in the battery cell 10 can be reliably prevented from reaching the user.

  Due to the configuration of the backrest wall 31, the outer wall 32, the upper wall 33, the side wall 35, and the heat insulating material 14, the amount of heat transmitted to the backrest wall 31 among the heat generated from the battery cell 10 is as follows. 33 and the amount of heat transferred to the side wall 35.

  A heat exhauster 18 (heat sink) is attached to the outer wall 32. The heat exchanger 18 has an outer surface that comes into contact with the outside air and an inner surface that forms a surface inside the case. The heat exhauster 18 is preferably made of a material having a thermal conductivity higher than the thermal conductivity of the case portion 12. As an example, the heat exhauster 18 is comprised with metals, such as copper, aluminum, iron, and an alloy containing these. Further, fins are provided on at least one of the outer surface and the inner surface of the heat exhauster 18 to increase the effective area in contact with the gas on each surface to efficiently conduct the heat on the inner surface to the heat exhauster. It is preferable to configure so that heat is dissipated. In addition, the shape of the fin may be configured such that, for example, a stripe shape extending in one direction such as a vertical or horizontal direction of the bellows shape, or a line extending in at least two directions such as the vertical and horizontal directions intersects. The structure which has a through-hole for a heat transfer medium to pass through in a part of fin may be sufficient. In addition, when the shape of a fin is extended in the direction which corresponds with the flow direction of a heat transfer medium, it can exhaust heat more efficiently. For example, exhaust air can be efficiently exhausted by using convection air, which will be described later, as a heat transfer medium and placing fins in a direction along the flow of the medium. Here, the shape of the surface of the heat exhauster 18 is not limited to the fin shape described above, and any shape can be adopted as long as the surface area is increased by unevenness or the like to an extent sufficient to dissipate heat. . In other words, the surface area per unit area in the heat exhauster 18 may be a structure larger than the surface area per unit area in the case 12.

  In the present embodiment, as an example, the fan 19 is provided inside the case 12. As described in FIG. 2 and the like, in the present embodiment, a structure in which a fan 19 is provided below the battery cell 10 and the protective substrate 15 is illustrated. The fan 19 can be rotated by electric power from the battery cell 10. The protective substrate 15 is exemplified by a structure placed in a region between the fan 19 and the battery cell 10. In this structure, the fan 19 and the protective substrate 15 are arranged in a horizontal plane extending in the front-rear and left-right directions. Are arranged so that there is a non-overlapping area. That is, the protective substrate 15 extends in the horizontal plane, but does not occupy the entire interior of the case portion 12 in the horizontal plane, and is provided only in a part of the air blowing path. Therefore, the protective substrate 15 does not block the air flow by the fan 19 and is configured to remove the heat generated from itself by blowing air from the fan 19.

  In the present embodiment, as the fan 19 rotates, the air inside the case portion 12 circulates as indicated by an arrow A. Specifically, the air rises from the place where the fan 19 is provided, and enters the inside of the frame 51 through a through hole 51a such as a lower portion of the frame 51 provided around each battery cell. Inside the frame 51, air passes around the battery cell 10. At this time, air is heated by the heat from the battery cell 10. Furthermore, it is discharged to the outside of the frame 51 through a through hole 51 a such as the upper part of the frame 51, passes through the vicinity of the inner surface of the heat exhauster 18, and returns to the vicinity of the fan 19. That is, the inner surface of the heat exhauster 18 is provided on a flow path through which air in the case portion 12 convects. When air passes in the vicinity of the inner surface of the fin, the heat moves to the heat exhauster 18 and is exhausted to the outside of the case portion 12 through the heat exhauster 18.

  A backpack portion 13 is provided at a position facing the backrest wall 31. The backpack 13 has a backpack and a shoulder belt, and the user carries the backpack power source 1 by putting the shoulder belt on the shoulder. In the present embodiment, the backpack portion 13 is exemplified by a configuration that is coupled to the backrest wall 31 at a position facing the user's back, but is not limited to this configuration, and any position of the case portion 12 However, any configuration that can fix the case portion 12 to the backpack 13 can be used. For example, the upper wall 33, the bottom wall 34, or the side wall 35 and the backpack 13 may be coupled (fixed). In this case, the coupling (fixing) is not only a fixing method that does not require attachment / detachment (such as fitting, welding, sewing, etc.), but also a slide rail, manual screw, hook-and-loop fastener, etc. A configuration is also included in which the user can freely attach and detach the back 12 and the backpack 13.

  In the present embodiment, a total of 80 lithium ion secondary battery cells (hereinafter referred to as battery cells) 10 are provided in the case portion 12 as an example, and for example, 10 series batteries are arranged in two rows in parallel. Four connected battery units are provided.

  The protective substrate 15 protects the battery cell 10 from overdischarge and overcharge. The protective substrate 15 monitors the voltage of the battery cell 10 and stops discharging and charging of the battery cell 10 when a failure of the battery cell such as overdischarge or overcharge is determined. In this embodiment, a configuration in which a protective substrate is provided in the lower part of the case is illustrated, but the protective substrate can be provided in any place inside the case, and the protective substrate needs to be cooled. It is preferable that the air is provided on the flow path through which the air in the case portion 12 convects.

  The power cable 16 supplies power from the battery cell 10 to the adapter 17. The adapter 17 has a shape that can be connected to the power tool 20, and outputs power of the secondary battery to the power tool 20 when connected to the power tool 20.

  According to the configuration of the back-type power source 1 described above, since the heat exhauster 18 is provided, the heat generated in the battery cell 10 is moved by the air flow by the heat transfer means, that is, the fan 19, and is exhausted. It moves outside through the vessel 18. Thereby, since heat is radiated from the heat exhauster 18, it is difficult to be transmitted to the back wall. That is, in the present invention, the heat generated in the power source is radiated from the member far from the user, so that the user can feel the hot air and can work comfortably. Further, a heat insulating material 14 is provided inside the backrest wall 31 of the case 12. Since the heat insulating material 14 blocks the movement of heat from the battery cell 10 to the back wall 31, the user can work without feeling hot air. Moreover, since the heat insulating material 14 is provided inside the backrest wall 31, the size of the entire apparatus can be made compact.

  The backpack type power supply according to the present invention is not limited to the above-described embodiments, and various improvements and modifications can be made within the scope described in the claims.

  In the above embodiment, air is used as a medium for transferring heat. However, when a gas is used, any gas is used as long as it is a gas other than air and does not corrode the heat flow path. It can be adopted. More preferably, the gas should have a chemically stable element / composition. As an example, an inert gas such as nitrogen or a rare gas can be employed.

  Although the heat exhaust device 18 is provided on the outer wall 32, it is not limited to such a configuration, and the inner surface of the heat exhaust device 18 may be provided on the air flow path inside the case portion 12. For example, as shown in FIG. 3, the upper wall 33 may be provided in an area adjacent to the upper part of the battery cell 10 or the outer wall 32 of the upper wall 33. Also in this case, the heat from the secondary battery 10 can be efficiently exhausted via the exhaust heat unit 18. Further, the exhaust heat unit 186 may be provided in a region adjacent to the upper wall 33 of the side wall 35. Alternatively, a plurality of exhaust heat units 186 may be provided in at least one region of the outer wall 32, the upper wall 33, and the side wall 35.

  In the above embodiment, the circulating air is configured to transmit the heat generated from the battery cell 10 to the heat exhauster 18. For example, as shown in FIG. A heat conducting member 61 that connects the heat exhauster 18 may be provided. For example, the heat conduction member 61 is a member having a higher thermal conductivity than the case portion 12 (for example, a metal such as copper, aluminum, iron, or a carbon-based material such as an alloy carbon fiber thereof, and a resin or rubber containing them. For example, a high thermal conductivity material (TIM). In addition, it is preferable to ensure the insulation between the battery cell 10 and the heat conducting member through an insulating material such as an insulating sheet or silicon grease at a location where the battery cell 10 is in contact with the heat conducting member. In the case where the heat conducting member is provided, the fan 19 may not be provided, or the fan 19 may be provided, and the air and the heat conducting member may be responsible for heat transfer. The heat conducting member 61 may be a heat pipe. In this case, the heat conducting member 16 is formed in a hollow shape, preferably a closed structure having a circulation structure, and contains water, a fluorocarbon-based or alternative refrigerant material, ethers such as dimethyl ether, carbon dioxide, etc. A medium responsible for heat conduction is enclosed.

Alternatively, as shown in FIG. 5, a pump 65 and a pipe 66 filled with a cooling liquid are provided in the case portion 12, and heat generated from the battery cells 10 is exhausted from the heat exhauster 18 by water cooling. You may make it do. Here, the coolant is, for example, water, ethylene glycol, lower alcohols, ethers, etc., or an aqueous solution thereof, so-called “water-cooled”,
Any cooling liquid used in a structure called “oil-cooled” or the like can be applied. The tube 66 has a cylindrical structure, and a closed space is formed therein. The cooling liquid is enclosed in such a closed space. The pipe 66 constitutes a path that circulates in the case portion 12 and passes in the vicinity of the battery cell 10 and the heat exhauster 18. The pipe 66 is connected to the pump 65. The pump 65 applies pressure to the coolant and circulates the coolant in the pipe 66 in the direction indicated by the arrow B. Thereby, the heat generated from the battery cell 10 is transferred to the heat exhauster 18 by the coolant. The coolant is cooled by the heat exhauster 18 and moves to the battery 10 again. Also in this case, the fan 19 may not be provided, or the fan 19 may be provided and the air and the coolant material may be responsible for heat transfer.

  Alternatively, as shown in FIG. 6, a compressor 75, a pipe 76 filled with a refrigerant, and an expansion valve 77 are provided inside the case portion 12, and heat generated from the battery cell 10 is exhausted by an air compressor system. The heat may be exhausted from 18. The tube 66 has a cylindrical structure, and a closed space is formed therein. The refrigerant is sealed in such a closed space, and is preferably made of a known heat exchange medium such as a fluorocarbon type or alternative refrigerant material, ethers such as dimethyl ether, carbon dioxide and the like. The pipe 76 forms a path that circulates in the case portion 12, and passes through the vicinity of the battery cell 10 and the heat exhauster 18. The pipe 76 is connected to the compressor 75 and the expansion valve 77. In addition, the pipe | tube 76 in the frame 51 is provided with the structure which cools a refrigerant | coolant, for example, a fin etc., and has a function as an evaporator. The compressor 75 compresses the refrigerant and sends the refrigerant in the direction indicated by the arrow C toward the heat exhauster 18. The refrigerant cooled by the heat exhauster 18 is liquefied and moves toward the expansion valve 77. When the expansion valve 77 is opened, the refrigerant moves toward the pipe 76 in the frame 51 and is vaporized to expand. The air around the tube 76 is cooled in the frame 51 by the heat of vaporization at this time. Further, as the fan 19 rotates, the cooled air inside the frame 51 is blown upward. In addition, although the pipe | tube 76 showed the structure which has a function of an evaporator, you may provide an evaporator separately. Moreover, the piping method of the pipe 76, the position of the compressor 75, and the like can be changed as appropriate. In particular, when the compressor 75 is provided in the lower part, the center of gravity of the backpack type power supply 1 can be lowered.

  Further, instead of the heat exhauster 18, an exhaust hole penetrating the case portion 12 may be provided in the outer wall 32, and the heated air may be directly exhausted from the exhaust hole. In addition, when gas (for example, hydrogen, a carbon dioxide, etc.) generate | occur | produces from the members which comprise the inside, such as the water vapor | steam inside the case part 12, a secondary battery cell, etc. here, those gases also generate | occur | produce. included. FIG. 7 is a cross-sectional view showing details of the exhaust port as an example. For example, the exhaust hole has a wall portion 41 having a labyrinth structure in which an opening portion is bent and communicates with the inside, and an exhaust port 43 and a partially small-diameter drain port 42 are formed in the wall portion 41. . The labyrinth structure of the wall portion 41 prevents water from flowing into the exhaust port 43 and reaching the battery cell 10, and even if water has entered through the exhaust port 43, drainage provided in the middle of the exhaust path. Drained from the mouth 42. Further, an air intake hole may be provided in the lower portion of the fan 19 so that air is sucked from the air intake hole. It should be noted that the positions of the exhaust holes and the intake holes are merely shown as an example, and it is sufficient that one or a plurality of positions are provided at any location of the case portion 12. Moreover, the point which made the opening part the labyrinth structure was also shown as an example, for example, a fiber, a thin film, a film, or the like that permeates a gas such as air, hydrogen, water vapor, and the like, and the penetration of water droplets is suppressed. When there is a low possibility of intrusion of water from the outside, such as by providing an opening made of material, or the intruded water is discharged without coming into contact with a member that should be isolated from water, such as a secondary battery cell, circuit part, wiring part, etc. When the structure is provided, the labyrinth structure can be omitted.

  Further, in the above embodiment, the thickness of the outer wall 32, the upper wall 33, and the side wall portion 35 is configured to be thinner than the thickness of the backrest wall 31 for heat dissipation. The thickness of the portion may be configured to be thinner than the thickness of the backrest wall 31. For example, the thickness of the upper half area of the outer wall 32 and the thickness of the front half area of the upper wall 33 may be configured to be thinner than the thickness of the back wall 31. In addition, the thickness of at least a part of the side wall 35, for example, the thickness of the region adjacent to the outer wall 32 and the upper wall 33 may be configured to be thinner than the thickness of the back wall 31.

  In the present embodiment, an example in which the case portion 12 is made of a resin has been shown. However, other materials, for example, a metal, a ceramic-based material, or a structure in which these materials including a resin are combined or laminated. It may be a configuration. In general, a conductive material such as a metal has a higher thermal conductivity than an insulating resin or the like, and therefore, heat can be dissipated more efficiently by adopting these materials for the outer wall 32 or the like. In this case, it is good also as a structure which shared or shared the site | part for radiating heat with respect to the exterior of a case among the heat sinks 18 with the other part of the case part 12. FIG. In the case where the case portion 12 is made of a conductive material such as metal, the case portion 12 and the battery cell 10, for example, the frame 51 that houses the battery cell 10 or the like, if necessary. An insulating member such as a sheet shape may be provided, and the battery cell 10 can be prevented from being in electrical contact with the case portion 12. Alternatively, when the case portion 12 is made of metal, only the frame 51 may be made of an insulating material.

  Further, as the material of the case part 12, a cloth-like material made of a laminated body of nylon fiber or the like having a waterproof and ventilating function can be used. In this case, the case part 12 itself has an intake / exhaust function. In addition to being able to efficiently dissipate heat in that it can be provided, it is also suitable for reducing the weight of the case portion 12. In this configuration, similarly to the above-described embodiment, the configuration may be such that heat is radiated to the outside of the case using both the inside and outside of the heat exhauster 18, and the structure of the heat exhauster 18 described above. Among these, only the structure of the inner part of the case part 12 may be applied, and the heat exhausted to the outside of the case part may be configured to exhaust using the ventilation of the cloth-like material.

  As another form, as in the heat conducting member 61 illustrated with reference to FIG. 4, a metal, graphite, carbon fiber, or the like having a high thermal conductivity between the frame 51 and the heat exhauster 18 as shown in FIG. And a heat transfer means 81 made of a highly heat conductive material (TIM) made of a resin, rubber or the like containing the carbon material, and in contact with the heat transfer means 81 or the heat transfer means A Peltier effect element (thermoelectric conversion element) using the Peltier effect may be provided in a form sandwiched by 81. Furthermore, not only the heat transfer means 81 but also other members constituting the case portion 12 such as the frame 51 and the circuit board are made of a material having a high thermal conductivity, so that the battery cell 10 and the elements constituting the internal circuit Heat from (for example, an FET element) can be efficiently transmitted by the heat exhauster 18. In addition, when a metal is used for the frame 51 or the like as a material having high thermal conductivity, an insulating member such as a sheet shape may be provided between the frame 51 and the battery cell 10 as necessary. Further, in the present embodiment, the configuration in which the fan 19 is provided as shown in FIG. 8 is suitable for controlling the temperature of the members constituting the inside of the case portion 12, for example, equalizing the temperature between the component parts. Although it is embodiment, it is not an essential structure and it is good also as a structure which does not have a fan.

  In the above embodiment, the heat insulating material 14 is provided inside the case portion 12 on the back wall 31 side. However, the heat insulating material 14 is outside the back wall 31 and the user's back or back portion. For example, a configuration as shown in FIG. 9 may be used. In this case, the heat insulating material 14 not only blocks heat but also spatially separates the battery cell 10 and the like as a heat source from the user's back, thereby further suppressing the user from feeling hot air. Can do. In this case, the material constituting the heat insulating material 14 may be a structure that forms a cushion of a portion that contacts a user's back by forming a resin or urethane foam having low thermal conductivity.

  The size of the heat insulating material 14 in the vertical and horizontal directions may not be larger than the size in the vertical and horizontal directions of the region where the battery cells 10 are arranged, and the heat insulating material 14 may be a plurality of small pieces. In this case, for example, the small piece may be provided only in at least a part of the portion in contact with the user and not provided in the portion that does not contact the user. The heat insulating material 14 is not only used in combination with the configuration (FIG. 2) provided inside the case portion exemplified in the above embodiment or the configuration (FIG. 9) provided outside the case portion. If the back 31 is provided between the wall 31 and the user's back, the back 31 may be provided only in the back or in combination. In this case, the heat insulation is further improved.

DESCRIPTION OF SYMBOLS 1 Back type power supply 12 Case part 13 Back side part 10 Battery cell 14 Heat insulating material 18 Heat exhaust device 19 Fan

Claims (17)

A secondary battery cell;
A case for storing the secondary battery cell;
A backpack coupled to the case;
The case has a backrest wall portion facing the backpack portion, and an outer wall portion other than the backrest wall portion,
The case-type power supply including a heat flow path for moving heat generated from the secondary battery cell or internal circuit to the outside of the case.   The backside power source according to claim 1, wherein the heat flow path further includes a heat exhaust unit that exhausts heat generated inside the case to the outside of the case.   The backside power source according to claim 2, wherein the heat exhausting means is provided on the outer wall portion.   The back heat power source according to any one of claims 1 to 3, wherein the heat flow path has a circulation structure inside the case.   The back-loading type power source according to any one of claims 1 to 4, wherein a medium for transferring heat in the heat flow path is air or a chemically inert gas. Further comprising a blowing means inside the case,
6. The back-type power source according to claim 2, wherein the blower unit moves heat generated inside the case to the exhaust heat unit via the heat flow path. The heat flow path has a cylindrical structure of a closed space inside the case,
5. The back-type power source according to claim 1, wherein a medium that moves heat on the heat flow path is a liquid. 6.   The back-type power supply according to claim 7, wherein the medium for transferring heat on the heat flow path is water or a liquid mainly composed of ethylene glycol. The case further includes a liquid conveying means,
The backpack type power supply according to claim 7 or 8, wherein the liquid transport means is provided on the heat flow path and transports the medium for moving the heat. The heat flow path has a cylindrical structure of a closed space inside the case,
The cylindrical structure has a refrigerant inside,
The backpack type power supply according to any one of claims 1 to 4, wherein the cylindrical structure compresses the refrigerant in a part of the section. The heat flow path has a compressor,
The backpack power source according to claim 10, wherein the refrigerant is compressed by the compressor.   The back heat power source according to any one of claims 1 to 3, wherein the heat flow path is made of a metal material, a carbon material, or a high heat material containing these as a main component.   The back-type power supply according to any one of claims 1 to 3 and claim 12, wherein a Peltier effect element is disposed on the heat flow path or a part of the heat flow path.   14. The backpack type power source according to claim 2, wherein the exhaust heat means has a heat radiating member made of a material having a higher thermal conductivity than the outer wall of the case.   The heat exhausting means includes a heat radiating member having a structure in which a surface area per projected unit area on a surface in contact with a gas inside the case or outside the case is wider than that of the outer wall portion of the case. The backpack type power supply according to any one of 14.   The backside power source according to claim 15, wherein the heat dissipation member has a fin structure.   The backside power source according to any one of claims 2 to 16, wherein the exhaust heat means has an exhaust part in the outer wall of the case.

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