WO2014077386A1

WO2014077386A1 - Shouldered power supply

Info

Publication number: WO2014077386A1
Application number: PCT/JP2013/081027
Authority: WO
Inventors: 牧野　大介; 伸二渡部; 友敬原野
Original assignee: 日立工機株式会社
Priority date: 2012-11-19
Filing date: 2013-11-18
Publication date: 2014-05-22

Abstract

A shouldered power supply (1) has secondary battery cells (10), a case (12) housing the secondary battery cells, and a shouldered portion (13) attached to the case. The case (12) has a first wall section (31) facing the shouldered portion (13) and second wall sections (32, 33, 34) other than the first wall section and is equipped with a temperature increase prevention means (14) for preventing the temperature of the first wall section (31) from increasing.

Description

Back load type power supply

[Technical Field] The present invention relates to a back-type 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 large capacity power source such as a backpack type. Secondary batteries generally increase in temperature during charging or discharging, so in a backpack type power supply that has a large number of secondary batteries and can be used for a long time and high output, improvement of user comfort, From the viewpoint of extending the life of components constituting the power source such as the secondary battery cell, it is necessary to efficiently release the 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 attached to the case, and the case faces the backpack. A back wall comprising a first wall portion and a second wall portion other than the first wall portion, and comprising temperature rise suppression means for suppressing a temperature rise of the first wall portion. Provide power supply.

According to the above configuration, the temperature rise of the first wall is suppressed, and it is difficult for the user who carries the back-type power source to transmit. Therefore, the user can work comfortably without feeling heat.

It is preferable to suppress an increase in the temperature of the first wall part by making the thermal conductivity of at least one of the first wall part and the backpack part lower than that of the second wall part.

According to the above configuration, the amount of heat transferred from the inside of the case to the outer surface of the first wall portion through the first wall portion, such as the plurality of secondary battery cells, from the plurality of secondary battery cells, Since the amount of heat transferred to the second wall portion is smaller, the heat is released from the second wall portion and is less likely to be transmitted to the user who carries the back-type power source. Therefore, the user can work comfortably without feeling heat.

Further, it is preferable that the first wall portion or the backpack portion has a heat transfer adjusting means for reducing a heat transfer amount. Thereby, by providing the heat transfer adjusting means according to the amount of heat generated from the internal heat source, heat conduction can be more effectively suppressed, and the user can work comfortably without feeling heat. Can do.

Further, it is preferable that the heat transfer adjusting means is a heat insulating material provided inside the first wall portion or the backpack portion. Since the amount of heat transferred from the heat source inside the case such as the secondary battery cell to the first wall portion is further reduced by the heat insulating material, the user can work more comfortably. In this configuration, since the heat insulating material is provided inside the first wall portion or the backpack portion, the size of the entire apparatus can be made compact. As used herein, the term “heat insulating material” refers not only to a material that substantially blocks heat transfer, but also to a low thermal conductivity material that has a function of reducing heat transfer within a practical range, continuous pores, or independent pores. It means a porous material having a hollow structure, a hollow structure or the like.

The heat transfer adjusting means may be a heat insulating material provided in contact with the outside of the first wall portion or the backpack portion in addition to or inside the backrest portion or the backpack portion. preferable. Also in this case, the amount of heat transmitted from the heat source inside the case such as the secondary battery cell to the first wall portion is reduced by the heat insulating material. In addition, since the heat insulating material is provided outside the first wall portion and the like, not only can the user and the secondary battery cell be spatially separated, but also heat insulation is performed to prevent the user's back from stuffiness. The size, shape, and number of the material and the gaps can be arbitrarily defined. Therefore, the user can work more comfortably.

By making the thickness of the outer wall thinner than the thickness of the first wall portion, the amount of heat transferred from the plurality of secondary battery cells to the first wall portion is increased from the plurality of secondary battery cells to the first. It is preferable that the amount of heat transferred to the outer wall opposite to the wall portion of the wall is less. Furthermore, it is more preferable to reduce the thickness of the upper part of the case among the outer walls. With the configuration of the outer wall and the first wall portion, heat can be effectively prevented from being transmitted to the user. When the thickness of the upper portion of the case is reduced, the heated air inside the case Since it rises to the upper part of a case, it can exhaust heat more efficiently.

It is preferable that the case other than the first wall portion is made of a material having at least a part of a material having a higher thermal conductivity than a material constituting the first wall portion. Furthermore, it is more preferable that at least a part of the upper part of the case other than the back wall is made of a material having high thermal conductivity. With such a configuration of the upper wall and the first wall portion, heat can be effectively prevented from being transmitted to the user, and when the upper portion of the case is made of a material having high thermal conductivity, Since the heated air rises to the upper part of the case, it is possible to exhaust heat more efficiently.

The case preferably has a ventilation part on the outer wall of the case other than the first wall part as a heat transfer adjusting means, and the ventilation part is a ventilation port for intake or exhaust, and from a central part of the case outer wall. More preferably, it is provided at the upper part or at least one of the lower part than the central part. With such a configuration, the heated air can be effectively ventilated.

Further, it is preferable that the ventilation section is a ventilation port provided in the case for performing intake or exhaust. With such a configuration, intake or exhaust can be reliably performed. Moreover, it is preferable that the said ventilation port was provided in at least one of the upper part rather than the center part of a case outer wall, or the lower part rather than a center part. With such a configuration, intake or exhaust can be performed efficiently.

Further, it is preferable that the temperature rise suppression means has a heat flow path that is provided inside the case and releases heat generated in the case to the outside of the case.

According to the above configuration, the heat generated in the case through the heat flow path can be efficiently transferred to the outside of the case.

Moreover, it is preferable that the heat flow path further includes a heat exhaust unit that exhausts heat generated inside the case to the outside of the case. Moreover, it is preferable that the said front heat exhausting means is provided in a said 2nd 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.

It is preferable that 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 of a closed space inside the case, and the medium for moving heat on the heat channel is a liquid. The medium for transferring heat along the heat flow path 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 that moves 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 effectively by utilizing 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. .

It is preferable that 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. Further, the exhaust heat means preferably has a heat radiating member having a structure in which the surface area per unit volume in the surface in contact with the gas inside the case or outside the case is wider than that of the case second wall, The structure satisfying the condition 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 backpack type power supply of the present invention, the temperature rise of the first wall portion facing the backpack portion of the case can be suppressed. For example, heat generated inside a case such as a plurality of secondary battery cells is released from the second wall portion other than the first wall portion facing the backpack portion, and is not easily transmitted to the first wall portion. Therefore, the user can work comfortably without feeling heat. In addition, by increasing the thermal conductivity of the second wall other than the first wall facing the backpack of the case, the efficiency of air cooling by outside air such as wind is improved and the temperature rise inside the case is reduced. In addition, deterioration of components such as secondary batteries is suppressed.

Also, heat generated in the case through the heat flow path can be efficiently released to the outside of the case. Therefore, the user can comfortably carry the case on the back 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 which shows the detail of an exhaust part. 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 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.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an overview of a back load type power source according to a first embodiment of the present invention. Detailed configuration is omitted.

As shown in FIG. 1, the backpack-type power source 1 according to the present embodiment has a case section 12 that houses battery cells 10 (FIG. 2) made up of a plurality of secondary batteries housed therein as a case. Electric power is supplied to electric tools (including small agricultural implements and the like) connected via cables. In the present embodiment, as shown in FIG. 1, the power supply cable 16 and the adapter 17 connected to the lower part of the backpack type power supply are connected to a tool or the like (not shown). 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 load power source 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 as a first wall portion located on the back side of the user, an outer wall 32 facing the backrest wall 31 through the battery cell 10, an upper wall 33, and a bottom wall 34. And a pair of side walls 35 (FIG. 1). The outer wall 32, the upper wall 33, and the bottom wall 34 constitute a second wall portion. The thickness of at least one of the outer wall 32, the upper wall 33, and the side wall 35 is a member that is thinner than the thickness of the back wall 31 and sufficiently conducts heat. A battery cell 10 made of a secondary battery and a protective substrate 15 are accommodated in the case portion 12. Case part 12 consists of resin, for example, and has separated battery cell 10 and protection board 15 from the outside. Further, a heat insulating material 14 is provided inside the backrest 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.

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, it can suppress that the heat which generate | occur | produced in the battery cell 10 reaches the outer surface 31A of the backrest wall 31, ie, it can prevent reliably reaching a 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 from the battery cell 10 to the outer surface 31 </ b> A of the backrest wall 31 is the outer wall 32. The amount of heat transferred to the upper wall 33 and the side wall 35 is smaller.

The back wall 31 is provided with a backpack 13. 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. When the user carries the back-type power supply 1 on the back, the backrest wall 31 faces the user's back. Moreover, the exhaust part 36 is provided in the outer wall 32 as a ventilation part which exhausts | emits the heat inside a case efficiently. In the present embodiment, the exhaust part 36 is provided at a position adjacent to the upper wall of the outer wall 32. Further, in the present embodiment, the bottom wall 34 is provided with an air inlet 37.

FIG. 3 is a cross-sectional view showing details of the exhaust part 36. It is desirable that the exhaust unit 36 has a structure that prevents rainwater from entering, assuming that the backpack-type power supply 1 is used in outdoor rain. The exhaust part 36 has a wall part 41 having a labyrinth structure in which an opening part 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 part 41. The labyrinth structure of the wall portion 41 prevents water flowing in from the exhaust port 43 from reaching the battery cell 10 and drainage provided in the middle of the exhaust path even if water enters through the exhaust port 43. Drained from the mouth 42.

In the present embodiment, as an example, a total of 80 lithium ion secondary battery cells (hereinafter referred to as battery cells) 10 are provided in the case portion 12. For example, 10 battery cells 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 or charging the battery cell 10 when it is determined that a failure of the battery cell such as overdischarge or overcharge occurs. In this embodiment mode, a configuration in which a protective substrate is provided in the lower part of the case is shown, but the protective substrate can be provided in any place inside the case.

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 battery cell toward the power tool 20 when connected to the power tool 20.

According to the configuration of the back load type power source 1 described above, the outer wall 32, the upper wall 33, and the side wall 35 are thinner than the back wall 31. For this reason, the heat generated in the battery cell 10 is easily conducted from the backrest wall 31 side to the outer wall 32 side and the upper wall 33 side. That is, the amount of heat transferred from the battery cell 10 to the outer surface 31 </ b> A of the back wall 31 is less than the amount of heat transferred from the battery cell 10 to the outer wall 32. Therefore, heat is released from the outer wall and is not easily transmitted to the outer surface 31A of the backrest wall. Thereby, the amount of heat reaching the user carrying the power source 1 is reduced, and the user can comfortably work without feeling hot air. 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 outer surface 31 </ b> A of the backrest 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 exhaust part 36 is provided at a position adjacent to the upper wall 33 of the outer wall 32. Since the heated air rises, the air can be efficiently discharged from the exhaust part 36. In this case, in the case where gas (for example, hydrogen, carbon dioxide, or the like) is generated from members constituting the interior such as water vapor inside the case portion 12 or battery cells, the gas includes these gases.

Furthermore, in the present embodiment, since the air inlet 37 is provided in the bottom wall 34, the outside air can be efficiently taken in from the air inlet 37 and the heated air can be discharged from the exhaust part 36. In addition to the method of performing ventilation by natural convection, a configuration may be adopted in which a fan is provided in the vicinity of the intake port or the exhaust port to forcibly perform intake and exhaust.

In the above embodiment, the exhaust part 36 is provided in a region adjacent to the upper wall 33 of the outer wall 32, but the upper portion of the battery cell 10 in the upper wall 33 or a region adjacent to the outer wall 32 of the upper wall 33. May be provided. Also in this case, the heat from the battery cell 10 can be efficiently released from the exhaust part 36. Further, the exhaust part 36 may be provided in a region adjacent to the upper wall 33 of the side wall 35. Alternatively, a plurality of exhaust parts 36 may be provided in at least one region of the outer wall 32, the upper wall 33, and the side wall 35. The exhaust part 36 and the intake port 37 are not essential if the heat radiation of the outer wall 32 or the like is sufficient for the amount of heat generated by the battery cell 10 or the like, or the structure without the exhaust part 36 and the intake port 37, or It is possible to have only one of the configurations. Or the structure which employ | adopts the raw material which has air permeability for at least one part of a case part, and gives the case part itself the function of this inhalation | air_intake and exhaust_gas | exhaustion may be sufficient.

It should be noted that the positions and the number of the exhaust ports and the intake ports are merely shown as an example, and one or a plurality of the exhaust ports and the intake ports may be provided at any location of the case portion 12. Moreover, the point which made the opening part the labyrinth structure was only shown as an example, for example, materials, such as a fiber, a thin film, or a film which permeate | transmit gas, such as air, hydrogen, water vapor | steam, and suppress the penetration | invasion of a water droplet You may provide the opening which consists of. Or, when there is a low possibility of intrusion of water from the outside, it has a configuration in which the intruded water is discharged without contacting with a member to be isolated from water such as a battery cell, a circuit part, a wiring part, etc. Sometimes the labyrinth structure can be omitted.

Next, a back load type power supply according to a second embodiment of the present invention will be described. As shown in FIG. 4, the backpack-type power source 1 according to the second embodiment includes a box-shaped case portion 12 in which a plurality of battery cells 10 are housed, A power cable 16 connected to the lower part of the power source, a backpack 13 and an adapter 17 are provided. Note that the same reference numerals are assigned to the same components as those of the backpack type power supply 1 of the first embodiment, and the detailed configuration and description of the effects are omitted.

The backpack type power supply 1 of the present embodiment is also assumed to be used in outdoor rain. For this reason, the case part 12 has an ideally hermetically sealed structure so that rainwater does not enter the power source 1, but it is conceivable that the case part 12 has a structure that does not have an opening at a site where the rainwater hits at least during use. In the present embodiment, 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.

The heat exhaust device 18 (heat sink) is attached to the outer wall 32 of the case portion 12. The heat exhauster 18 has an outer surface that comes into contact with 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 may be provided on at least one of the outer surface and the inner surface of the heat exhauster 18. The fins can widen the effective area in contact with the gas on each surface, and can efficiently conduct the heat on the inner surface to the heat exhauster, or can efficiently dissipate heat to the outside air. The shape of the fin is, for example, a stripe shape extending in one direction such as an accordion shape in the vertical or horizontal direction, or a line extending in at least two directions such as the vertical and horizontal directions intersects. It may be. Furthermore, the structure which has a through-hole for a heat transfer medium to pass in a part of fin may be sufficient. In addition, when the protrusion part of a fin extends in the direction which corresponds with the flow direction of a heat transfer medium, it can exhaust heat more efficiently. For example, by using convection air, which will be described later, as a heat transfer medium and placing the fin protrusions in the direction along the flow of the medium, heat can be efficiently exhausted. 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 for heat dissipation. . In other words, it is sufficient if the surface area per unit volume in the heat exhauster 18 is larger than the surface area per unit volume in the case 12.

In the present embodiment, the fan 19 is provided inside the case 12. As shown in FIG. 4, in the present embodiment, the fan 19 is provided below the battery cell 10 and the protective substrate 15. The fan 19 can be rotated by electric power from the battery cell 10.

The protective substrate 15 is placed in an area between the fan 19 and the battery cell 10. The protective substrate 15 is arranged such that there is a region that does not overlap the fan 19 in a direction that intersects with a horizontal plane that includes the protective substrate 15 and extends in the front-rear and left-right directions. 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 flow of air by the fan 19 and is configured to remove 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 51 a such as a lower portion of the frame 51. Inside the frame 51, air passes around the battery cell 10. When the battery cell 10 is discharged, the air is heated by the heat from the battery cell 10. The heated air is discharged to the outside of the frame 51 through the 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. Since the inner surface of the heat exhauster 18 is provided so as to be in contact with the flow path through which the air in the case portion 12 convects, heat is discharged when the air passes near the fins of the heat exhauster 18. 18 and is discharged to the outside of the case portion 12 via the heat exhauster 18.

In the present embodiment, the backpack 13 is coupled to the backrest wall 31 at a position facing the user's back. However, the configuration of the backpack 13 is not limited to the above, and any configuration can be used as long as the case 12 can be fixed to the backpack 13 at any position of the case 12. 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.

Although the protective substrate 15 is provided in the lower part of the case part 12 in the present embodiment, it can be provided at any location inside the case part 12. When the protection substrate 15 needs to be cooled, it is preferable to provide the protection substrate 15 on the flow path through which the air in the case portion 12 convects, that is, so as to be in contact with the flow path.

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 released from the heat exhauster 18, it is difficult to be transmitted to the back wall. That is, in the present invention, the heat generated inside the power supply is released from a member far from the user carrying the power supply 1, 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 outer surface 31A of the backrest 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 embodiment, 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 at least a part of the inner surface of the heat exhaust device 18 is provided so as to overlap the air flow path inside the case portion 12. Just do it. For example, as shown in FIG. 5, the heat exhauster 18 may be provided on the upper wall 33 that is the upper part of the battery cell 10 or in a region adjacent to the outer wall 32 of the upper wall 33. Also in this case, the heat from the battery cell 10 can be efficiently exhausted through the exhaust heat unit 18. Further, the exhaust heat unit 18 may be provided in a region adjacent to the upper wall 33 of the side wall 35. Alternatively, a plurality of exhaust heat units 18 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 insulation with the battery cell 10 and a heat conductive member through the insulating material, such as an insulating sheet and silicon grease, in the location which contact | connects the heat conductive member 61 of the battery cell 10. FIG. In the case of providing a heat conducting member, the fan 19 can be omitted. Alternatively, when the fan 19 is not omitted, 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 61 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. Enclose a medium responsible for heat conduction.

Alternatively, as shown in FIG. 7, 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 discharged from the heat exhauster 18 by the cooling liquid. You may make it do. Here, as an example, the coolant is used for structures called “water-cooled”, “oil-cooled”, etc., such as water, ethylene glycol, lower alcohols and ethers, and their aqueous solutions. Any coolant 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 direction indicated by the arrow B in the pipe 66. Thereby, the heat generated from the battery cell 10 is moved to the heat exhauster 18 by the coolant. The coolant is cooled by the heat exhauster 18 and moves to the battery cell 10 again. Also in this case, the fan 19 can be omitted. When the fan 19 is provided, air and the coolant may be responsible for heat transfer.

Alternatively, as shown in FIG. 8, a compressor 75, a pipe 76 in which a refrigerant is sealed, 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 method. It may be discharged from the vessel 18. The tube 76 has a cylindrical structure, and a closed space is formed therein. The refrigerant is enclosed in such a closed space, and is preferably made of a known heat exchange medium such as a fluorocarbon-based or alternative refrigerant material, ethers such as dimethyl ether, and carbon dioxide. 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 sent to the upper part. 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, 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 back wall 31 for heat dissipation. The thickness of a part 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. When 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, the inner wall of the case portion 12, etc. Moreover, you may provide insulating members, such as a sheet shape, as needed, and it can prevent that the battery cell 10 contacts the case part 12. FIG. Alternatively, when the case portion 12 is made of metal, only the frame 51 may be made of an insulating material.

Also, as the material of the case portion 12, a cloth-like material made of a laminate of nylon fiber or the like having a waterproof and air-permeable function can be used. In this case, not only can the case portion 12 itself be provided with an intake / exhaust function, heat can be efficiently radiated, but also the case portion 12 can be reduced in weight. In this configuration, similarly to the above-described embodiment, a configuration may be employed in which heat is radiated to the outside of the case using both the inside and outside of the heat exhauster 18. Moreover, only the structure of the internal part of case part 12 is applied among the structures of the heat exhaustor 18 mentioned above, and the exhaust heat to the exterior of a case part is the structure which exhausts using the ventilation | gas_flowing of a cloth-like material. There may be.

Further, as another embodiment, similarly to the heat conducting member 61 illustrated with reference to FIG. 6, a metal, graphite, or carbon fiber having a high thermal conductivity is provided 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 such a carbon-based material, and in contact with the heat transfer means 81 or the heat transfer A Peltier effect element (thermoelectric conversion element) using the Peltier effect may be provided so as to be sandwiched by the means 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 elements constituting the battery cell 10 and the internal circuit are formed. 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, the configuration in which the fan 19 is provided as shown in FIG. 11 is a preferred embodiment in that the temperature of the members constituting the inside of the case portion 12 is controlled, for example, the temperature between the components is made uniform. However, this is not an essential configuration, and a configuration without a fan may be employed.

In the above-described embodiment, the configuration in which the heat insulating material 14 is provided inside the case portion 12 on the backrest wall 31 side is shown. However, the heat insulating material 14 is outside the backrest wall 31 with the user's back, the back loader portion, and the like. It may be provided so that it may touch. Therefore, for example, the configuration shown in FIGS. 10 and 11 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 uses a resin having low thermal conductivity, urethane foam, or the like and serves as a cushion for a portion that comes into contact with the back of the user. Moreover, it is good also as a structure which provides the means to adjust heat transfer of the heat insulating material 14 grade | etc., Inside or outside the backpack part which comprises the backpack part 13, and it is also possible to use these together.

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 has a configuration (FIG. 2) provided inside the case portion exemplified in the above embodiment, a configuration in which a resin having low thermal conductivity is formed thick (backrest wall 31 in FIG. 10), or A configuration provided outside the case portion (FIG. 11) may be used in combination. Moreover, when it has a backpack part between the backrest wall 31 and a user's back, it is good also as a structure provided only in this backpack part, or using together, In this case, heat insulation property improves further. To do.

Industrial applicability

The present invention can appropriately suppress the temperature rise of the first wall portion facing the backpack portion due to heat generated from the inside of the case housing the battery cell made of the secondary battery as well as the backpack power source. Applicable to any power source.

DESCRIPTION OF SYMBOLS 1 Back negative power supply 10 Battery cell 12 Case 13 Back negative part 14 Heat insulating material 18 Heat exhaust device 19 Fan 31

1st wall part

32, 33, 34 2nd wall part

Claims

A secondary battery cell;
A case for storing the secondary battery cell;
A backpack attached to the case;
The case includes a first wall portion facing the backpack portion, and a second wall portion other than the first wall portion,
A backpack type power supply comprising temperature rise suppression means for suppressing temperature rise of the first wall portion.
The temperature rise of the first wall part is suppressed by making the thermal conductivity of at least one of the first wall part and the backpack part lower than that of the second wall part. Item 1. A negative power source according to item 1.
The back wall type power source according to claim 2, wherein the first wall section or the back section includes heat transfer adjusting means for reducing a heat transfer amount.
4. The back load type power source according to claim 3, wherein the heat transfer adjusting means is a heat insulating structure provided inside the first wall portion or the back load portion.
4. The back load type power source according to claim 3, wherein the heat transfer adjusting means is a heat insulating structure provided in contact with the outside of the first wall portion or the back load portion.
The back-type power source according to claim 2, wherein the case has a case thickness of at least a part of the second wall portion being thinner than a thickness of the first wall portion.
The back-type power supply according to claim 6, wherein the case has an upper part thinner than a thickness of the first wall part.
3. The case according to claim 2, wherein a material of at least a part of the second wall portion is made of a material having a higher thermal conductivity than a material constituting the first wall portion. Backpack power supply.
9. The back-type power supply according to claim 8, wherein the case is made of a material having a thermal conductivity higher than that of the material forming the first wall portion.
The backpack type power supply according to claim 2, wherein the case has a ventilation part on the case outer wall of the second wall part.
11. The back-type power source according to claim 10, wherein the ventilation unit is a ventilation port provided in the case for performing intake or exhaust.
12. The back-type power source according to claim 11, wherein the ventilation port is provided at least one of an upper portion of the outer wall of the case and a lower portion of the outer portion of the case.
The said temperature rise suppression means is provided in the inside of the said case, and has a heat flow path which discharge | releases the heat | fever generate | occur | produced in the said case to the exterior of a case, The Claim 1 thru | or 4 characterized by the above-mentioned. Backpack power supply.
14. The backpack type power source according to claim 13, wherein the heat flow path further comprises a heat exhaust means for exhausting heat generated inside the case to the outside of the case.
15. The back load type power source according to claim 14, wherein the exhaust heat means is provided on the second wall portion.
14. The back load type power source according to claim 13, wherein the heat flow path has a circulation structure inside the case.
The back-type power source according to claim 16, wherein the medium for transferring heat in the heat flow path is air or a chemically inert gas.
Further comprising a blowing means inside the case,
The backside power source according to claim 14, wherein the air blowing means moves heat generated inside the case to the exhaust heat means via the heat flow path.
The heat flow path has a cylindrical structure of a closed space inside the case,
The backpack type power supply according to claim 16, wherein a medium which moves heat on the heat channel is a liquid.
20. The back-type power source according to claim 19, wherein the medium for moving 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 source according to claim 19, wherein said liquid conveyance means is provided on said heat channel, and conveys the medium which moves said 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 source according to claim 16, wherein said cylindrical structure compresses a refrigerant in a part of the section.
The heat flow path has a compressor,
The backpack power supply according to claim 22, wherein the refrigerant is compressed by the compressor.
14. The back-type power source according to claim 13, wherein the heat flow path is made of a metal material, a carbon material, or a high thermal conductivity material mainly composed of these materials.
14. The back-type power supply according to claim 13, wherein a Peltier effect element is disposed on the heat flow path or a part of the heat flow path.
15. The back load power source according to claim 14, wherein the exhaust heat means includes a heat radiating member made of a material having a higher thermal conductivity than the outer wall of the case.
The exhaust heat 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 or outside the case is wider than that of the second wall portion. The backpack type power supply according to 14.
The back-type power source according to claim 27, wherein the heat dissipating member has a fin structure.