JP2016021277A - 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 1 includes: a secondary battery cell 10; a case 12 which stores the secondary battery cell 10; and a backpack part 13 attached to a backpack wall 31 of the case 12. The backpack wall 31 or the backpack part 13 of the case 12 has heat conduction lower than outer walls of the case 12 which exclude the backpack wall 31.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 attached to a back wall of the case. The abutment wall or the backpack portion provides a backpack type power source characterized in that heat conduction is lower than that of the case outer wall other than the abutment wall.

  According to the above configuration, the outer wall facing the back wall from the plurality of secondary battery cells, such as the plurality of secondary battery cells, the amount of heat transmitted from an internal heat source to the backpack through the back wall. Therefore, the heat is radiated from the outer wall and is not easily transmitted to the user. Therefore, the user can work comfortably without feeling heat.

  Moreover, it is preferable that the said backrest wall or a backpack part has a heat transfer adjustment means for making heat transfer amount small. 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.

  Moreover, it is preferable that the said heat transfer adjustment means is a heat insulating material provided in the inside of the said backrest wall or a backpack part. Since the amount of heat transferred from the heat source inside the case such as the secondary battery cell to the back wall 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 backrest wall or the backpack, 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.

  It is preferable that the heat transfer adjusting means is a heat insulating material provided in contact with the outside of the backrest wall or the backpack in addition to or inside the backrest or the backpack. Also in this case, the amount of heat transferred from the heat source inside the case such as the secondary battery cell to the back wall is reduced by the heat insulating material. In addition, since a heat insulating material is provided outside the back wall and the like, not only can the user and the secondary battery cell be spatially separated, but also the heat insulating material can be used to prevent the user's back from stuffiness. The size, shape, and number of 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 back wall, the amount of heat transferred from the plurality of secondary battery cells to the back wall faces the back wall from the plurality of secondary battery cells. It is preferable that the amount of heat transferred to the outer wall is smaller. Furthermore, it is more preferable to reduce the thickness of the upper part of the case among the outer walls. Such a configuration of the outer wall and the back wall can effectively prevent heat from being transmitted to the user. When the thickness of the upper part of the case is reduced, the heated air inside the case Since it raises to the upper part, it can exhaust heat more efficiently.

  It is preferable that the case other than the back wall is composed of a material having at least a part of the material having higher thermal conductivity than the material constituting the back wall. 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 the configuration of the upper wall and the back wall, heat can be effectively prevented from being transmitted to the user. When the upper part of the case is made of a material having high thermal conductivity, the heat inside the case can be reduced. The discharged air rises to the upper part of the case, so that heat can be exhausted more efficiently.

The case preferably has a ventilation part on the outer wall of the case other than the back wall as a heat transfer adjusting means, and the ventilation part is a ventilation port for intake or exhaust, and is above the central part of the outer wall of the case Or it is more preferable that it is provided in at least one of the lower part rather than the center part. With such a configuration, the heated air can be effectively ventilated.
Moreover, it is preferable that the said ventilation part is a ventilation port which performs the at least 1 intake or exhaustion provided in the said case. 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.

  According to the back load type power source of the present invention, heat generated from the plurality of secondary battery cells is radiated from the case outer wall other than the back abutment wall and hardly transmitted to the back abutment wall. Therefore, the user can work comfortably without feeling heat. In addition, the outer wall side of the case has a high heat transfer structure, which improves the efficiency of air cooling by outside air such as wind, reduces the temperature rise inside the case, and suppresses deterioration of components such as secondary batteries. To do.

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 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 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. The case portion 12 is made of, for example, resin, and separates the battery cell 10 and the protective substrate 14 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, 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 backpack 13 is provided on the back 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. Further, an exhaust part 36 is provided on the outer wall 32 as a ventilation means for efficiently discharging the heat inside the case. 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 as an example of a ventilation port. 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 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.

  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 the present embodiment, the configuration in which the 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.

  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 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 back wall 31 is less than the amount of heat transferred from the battery cell 10 to the outer wall 32. Therefore, heat is radiated from the outer wall and is not easily transmitted to the back wall. As a result, the amount of heat reaching the user is reduced, and the user can work comfortably 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 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 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 the present embodiment, since the air inlet 37 is provided in the bottom wall 34, it is possible to efficiently take outside air from the air inlet 37 and exhaust hot air 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.

  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.

  The exhaust part 36 is provided in a region adjacent to the upper wall 33 of the outer wall 32, but may be provided in an upper part of the battery cell 10 in the upper wall 33 or in a region adjacent to the outer wall 32 of the upper wall 33. Good. Also in this case, the heat from the secondary battery 10 can be efficiently radiated 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, and do not have the exhaust part 36 and the intake port 37. It is also possible to adopt a configuration or only one of the configurations, adopting a breathable material for at least a part of the case part, and providing the case part itself with the function of intake and exhaust Also good.

Although the thickness of the outer wall 32, the upper wall 33, and the side wall part 35 was comprised so that it might become thinner than the thickness of the backrest wall 31, at least one part thickness of the outer wall 32 grade | etc., Is the thickness of the backrest wall 31. You may be comprised so that it may become thinner than thickness. 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, an insulating member such as a sheet shape may be provided between the case portion 12 and the battery cell 10, for example, on the inner wall of the case portion 12 containing the battery cell 10, if necessary. It is possible to prevent the battery cell 10 from being in electrical contact with the case portion 12. It is also possible to use a cloth-like material made of a laminated body of nylon fiber or the like having a waterproof and ventilating function as the material of the case portion 12, and in this case, the case portion 12 itself has an intake / exhaust function. In addition to being able to efficiently dissipate heat, it is also suitable for reducing the weight of the case portion 12.

  In the above embodiment, the heat insulating material 14 is provided inside the case portion 12 on the side of the backrest wall 31, but the heat insulating material 14 contacts the user's back, the backpack portion, etc. outside the backrest wall 31. For example, the configuration as shown in FIG. 4 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. Furthermore, in the said embodiment, although the structure which provides the heat insulating material 14 in the back wall of a case was illustrated, the means to adjust heat transfer of the heat insulating material 14 grade | etc., Inside or outside of the back child part which comprises the back load part 13 Of course, it is also possible to use these in combination.

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 exemplified in the above embodiment, or a configuration in which a resin with low thermal conductivity is formed thick (backrest wall 31 in FIG. 4), It is good also as a structure which used together the structure provided in the exterior and backpack of the backrest wall 31, and in this case, heat insulation improves further.

DESCRIPTION OF SYMBOLS 1 Back negative power supply 12 Case part 13 Back negative part 10 Battery cell 14 Heat insulating material

Claims (11)

A secondary battery cell;
A case for storing the secondary battery cell;
A backpack attached to the back wall of the case;
The backpack type power supply according to claim 1, wherein the backrest wall or the backpack portion of the case has lower heat conduction than the case outer wall other than the backrest wall.   The backpack type power supply according to claim 1, wherein the backrest wall or the backpack has heat transfer adjusting means for reducing a heat transfer amount.   The backpack power source according to claim 2, wherein the heat transfer adjusting means is a heat insulating structure provided inside the backrest wall or the backpack.   4. The back load type power source according to claim 2, wherein the heat transfer adjusting means is a heat insulating structure provided in contact with an outer side of the backrest wall or the back load portion.   5. The backpack type power source according to claim 1, wherein the case has a case thickness of at least a part other than the backrest wall that is thinner than a thickness of the backrest wall.   The back-type power supply according to any one of claims 1 to 5, wherein the case has an upper portion thinner than a thickness of the backrest wall. The backpack according to any one of claims 1 to 6, wherein at least a part of the material other than the backrest wall is made of a material having higher thermal conductivity than a material constituting the backrest wall. Power supply. The back-type power source according to claim 1, wherein the case is made of a material having a higher thermal conductivity than a material constituting the backrest wall.
  The backpack type power supply according to any one of claims 1 to 8, wherein the case has a ventilation portion on the case outer wall other than the backrest wall.   The backpack type power supply according to claim 9, wherein the ventilation part is a ventilation opening provided in the case for performing intake or exhaust. The backpack type power supply according to claim 10, wherein the ventilation port is provided in at least one of an upper part of a case outer wall or a lower part of the case.

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