JPWO2016052266A1 - Electric tool and battery pack used therefor - Google Patents

Abstract

In order to provide a power tool and a battery pack that can be mounted with a battery pack with a reduced overall length (front and rear dimensions), or a compact and high-capacity battery pack that can be mounted with a plurality of cells, Each of the plurality of cells has a diameter of 16 mm and a capacity of 2.5 Ah, and all the cells are electrically connected in series to the battery case. A battery pack for an electric tool housed so as to be lined up in the front-rear direction and an electric tool using the same.

Description

The present invention relates to a power tool and a battery pack used therefor.

A technique for reducing the overall length (front-rear dimension) of an electric tool and making it compact has been proposed (see, for example, Patent Document 1).

JP 2014-117792 A

However, Patent Document 1 does not consider suppressing the front-rear dimension of the battery pack attached to the electric tool.

In view of such circumstances, the present invention provides an electric tool and a battery pack that can be mounted with a battery pack with a reduced overall length (front-rear dimension). It is another object of the present invention to provide an electric power tool and a battery pack that can be mounted with a high-capacity battery pack while being compact.

In order to solve the above problems, the present invention includes a plurality of cells and a battery case that accommodates the plurality of cells, each of the plurality of cells having a diameter of 16 mm and a capacity of 2.5 Ah. The battery pack is characterized in that the cells are electrically connected in series and accommodated in the battery case so as to be arranged in the front-rear direction.

According to the above configuration, a battery pack having a cell with a diameter of 16 mm and a capacity of 2.5 Ah, which is compact but has a high capacity, particularly a reduced overall length (front-rear dimensions) can be obtained.

The present invention also includes a plurality of cells and a battery case that accommodates the plurality of cells, each of the plurality of cells having a diameter of 16 mm and a capacity of 2.5 Ah. A first cell group electrically connected in series, and a second cell group electrically connected in series separately from the first cell group, the first cell group; The second cell group is electrically connected in parallel with each other to have a capacity of 5.0 Ah and is accommodated in the battery case so as to be lined up in the front-rear direction.

According to the above configuration, it is possible to obtain a battery pack that is compact but has a high capacity of 5.0 Ah, in particular, a reduced overall length (front-rear dimensions).

The plurality of cells constitute a first layer arranged in parallel with the front-rear direction and a second layer arranged in parallel with the front-rear direction above the first layer, and the first layer and the second layer Preferably, each of the plurality of cells constituting the layer is separated from each other in the front-rear direction, and the cells of the other layer are located at a separated position of one layer.

The present invention also provides a power tool characterized by having a mounting portion to which the battery pack can be mounted.

According to the above-described configuration, an electric tool including a battery pack that is compact but has a high capacity and particularly a reduced overall length (front-rear dimensions) can be obtained.

The present invention also includes a motor, a body part that accommodates the motor, a handle part having one end connected to the body part, and a battery pack that accommodates a plurality of cells provided at the other end of the handle part. A mounting portion, and a front-rear direction dimension of the mounting portion is the front-rear direction of the battery pack in which the four cells having a cell diameter of 18 mm are accommodated in parallel in the front-rear direction. Provided is an electric tool characterized in that it is configured to be substantially the same as the size and to be substantially the same as the size in the front-rear direction of the battery pack containing five cells each having a diameter of 16 mm.

According to the said structure, the electric tool which can mount | wear with a high capacity | capacitance battery pack can be obtained although it is compact.

When the battery pack is mounted on the mounting portion, the protruding amount of the battery pack from the front end of the mounting portion to the front is the battery in which five cells having a cell diameter of 18 mm are accommodated in parallel in the front-rear direction. In the case of a pack, it is more than the size of one cell, and in the case of the battery pack that accommodates five cells having a diameter of 16 mm, it is preferably less than the size of one cell. .

According to the said structure, the battery pack which accommodated five this cell whose diameter of this cell is 16 mm, and was high in capacity | capacitance, especially the full length (front-back dimension) was suppressed.

It is preferable that a gap is provided between cells arranged in parallel in the front-rear direction, and the cells are arranged in the gap from at least one of the upper side and the lower side.

A gap is provided between the cells, and the cells can be efficiently cooled.

The plurality of cells are preferably arranged in a staggered manner when viewed in the axial direction of the cells.

According to the above configuration, it is possible to obtain a battery pack that is compact but has a high capacity, particularly a reduced overall length (front-rear dimensions).

The present invention also provides a battery pack having a plurality of cells that are all electrically connected in series, and a battery case that houses the plurality of cells, the plurality of cells being arranged before and after the battery case. A first cell group housed in the battery case so as to line up in a direction, and a second cell housed in the battery case so as to be lined up and down with respect to the first cell group. The battery pack is characterized in that the first cell group and the second cell group are electrically connected in series.

According to the above configuration, it is possible to obtain a battery pack that is compact but has a high capacity, particularly a reduced overall length (front-rear dimensions).

The plurality of cells constituting the first cell group and the second cell group are preferably arranged in a staggered manner as viewed in the axial direction of the cells.

According to the said structure, since a cell is arrange | positioned so that a several layer may be piled up on a zigzag, the battery pack for electric tools with a short internal dimension of an output-axis direction can be provided.

Further, the present invention is a battery pack having a plurality of cells and a battery case that accommodates the plurality of cells, the plurality of battery cells being arranged in a staggered manner in the axial direction of the cells, A battery pack, wherein a space is formed between cells arranged in the front-rear direction of a plurality of battery cells, and a cooling air passage for the cells is formed between the space and the inner surface of the battery case. I will provide a.

According to the said structure, it becomes possible to cool a cell efficiently by providing a space between a battery case and a cell.

The present invention also provides a battery pack having a plurality of cells and a battery case that accommodates the plurality of cells, wherein the plurality of cells are arranged in a staggered manner when viewed in the axial direction of the cells. The battery case has a rib protruding upward from the inner surface of the battery case, and the rib is located in the space and is formed by the rib. A battery pack characterized by forming a cooling air passage is provided.

According to the above configuration, the cells are spaced apart from each other by the ribs, and the cells can be cooled by the space formed in the separated portion. Therefore, the battery can be efficiently cooled. In addition, by forming the spaced-apart portion, the number of cells facing the space can be increased, and the cooling efficiency can be improved.

The present invention also includes a plurality of cells, a holding member that holds the plurality of cells, a protective substrate that is disposed above the holding member and monitors the state of the plurality of cells, and a battery case that houses them. The plurality of cells are arranged in a staggered manner as viewed in the axial direction of the cells, and the holding member has a rib positioned in a space in the battery case where the plurality of cells are not positioned. The battery pack is characterized in that the protective substrate is supported by the rib.

According to the said structure, it becomes possible to cool a cell efficiently by providing a space between protective substrates.

The present invention also provides an electric tool characterized by having a mounting portion on which the battery pack can be mounted.

According to the above configuration, it is possible to obtain a power tool including a compact but high-capacity battery pack that has a particularly reduced overall length (front-rear dimension).

In order to solve the above problems, the present invention provides a battery that is detachable from a power tool having a plurality of cells and an output shaft, and the plurality of cells are arranged so that the axes of the plurality of cells are parallel to each other. And at least two of the plurality of cells are arranged in parallel to the output axis direction, and one of the plurality of cells is an intermediate cell adjacent to the two cells in common. And the axis of the intermediate cell is located between the axes of the two cells when projected from a direction orthogonal to the output axis and the axes of the plurality of cells. The distance between the axes is less than the sum of the outer diameters of the two cells. When the axes of the two cells are connected to the axes of the intermediate cells, the distance between the axes is 60 degrees when viewed in the axial direction of the plurality of cells. Provided is a battery pack for a power tool characterized by forming a triangle having at least one interior angle less than .

According to the above configuration, the arrangement of at least three cells is shifted vertically. As a result, the inner dimension in the direction of the output shaft is shorter than the sum of the outer diameters of the cells, and a compact battery pack for an electric tool can be obtained.

The triangle is preferably an isosceles triangle having a base angle of less than 60 degrees.

It is preferable that the line segments connecting the axes of the plurality of cells are arranged so as to form a plurality of rows parallel to the output axis when viewed in the axial direction.

The plurality of cells are preferably arranged in a staggered manner when viewed in the axial direction.

According to the said structure, since a cell is arrange | positioned so that a zigzag or several layers may be piled up, the battery pack for electric tools with a short internal dimension of an output-axis direction can be provided.

The present invention also includes a plurality of cells and a battery case that can be attached to and detached from an electric tool having an output shaft, and the plurality of cells are arranged so that the axes of the plurality of cells are parallel to each other. The battery and the battery case are arranged so as to be separated from each other via a rib.

According to the said structure, it becomes possible to cool a cell efficiently by providing a space between a battery case and a cell.

Further, the present invention comprises a plurality of cells and a battery case that can be attached to and detached from an electric tool having an output shaft, and the plurality of cells are arranged so that the axes of the plurality of cells are parallel to each other, At least two of the plurality of cells are spaced apart from each other via a rib.

According to the above configuration, the cells are spaced apart from each other by the ribs, and the cells can be cooled by the space formed in the separated portion. Therefore, the battery can be efficiently cooled. In addition, by forming the spaced-apart portion, the number of cells facing the space can be increased, and the cooling efficiency can be improved.

A plurality of cells, a protective substrate for controlling the current flowing through the plurality of cells, and an electric tool having an output shaft can be attached to and detached from each other, and the plurality of cells are arranged so that the axes of the plurality of cells are parallel to each other. There is provided a battery case, and the protective substrate and the plurality of cells are separated from each other via a rib.

According to the said structure, it becomes possible to cool a cell efficiently by providing a space between protective substrates.

The inner dimension in the output axis direction is preferably 90% or less of the sum of the outer diameters of the five cells.

According to the above configuration, it is possible to obtain a compact battery pack for an electric tool whose inner dimension is suppressed to 90% or less of the total of five cell outer diameters.

The present invention further includes an electric motor, an output shaft to which the drive of the electric motor is transmitted, and a housing that houses the electric motor, wherein the housing is the battery pack for the electric tool according to any one of the above. A power tool is provided that is detachable.

According to the above configuration, it is possible to realize an easy-to-handle electric tool provided with a compact electric power tool battery pack. Therefore, the work efficiency can be improved.

ADVANTAGE OF THE INVENTION According to this invention, the electric tool and battery pack which can mount | wear with the battery pack which suppressed the full length (front-back dimension) can be provided.

The left view of the impact driver which concerns on embodiment of this invention. Sectional drawing of the battery pack which concerns on embodiment of this invention. The figure which shows the flow of the (a) cross section and cooling air of the battery pack which concerns on embodiment of this invention, and sectional drawing along the bb line of (b) (a) figure. The figure which shows the flow of the (a) cross section and cooling air of the battery pack which concerns on a prior art, and sectional drawing along the bb line of (b) (a) figure. The left view of the impact driver which concerns on a prior art. (A) Sectional drawing of the battery pack which concerns on embodiment of this invention, (b)-(j) Sectional drawing of the battery pack which concerns on the modification of this invention.

<Embodiment> Embodiment which applied the electric tool which concerns on this invention to the impact driver 1 is described based on attached drawing. In the following description, the vertical direction and the front-back direction of the impact driver 1 are defined based on the state shown in FIG. Moreover, the state shown in FIG. 1 is called a left side surface, and the opposite side is called a right side surface. In addition, in this specification, “parallel” is a concept including “substantially parallel” as well as “substantially parallel” which is seen in parallel from the viewpoint of technical common sense as well as physically “strictly parallel”.

The impact driver 1 shown in FIG. 1 includes a housing 2, a trigger 4, and an output shaft 6 that are T-shaped when viewed from the side, and the battery pack 3 can be attached to the lower part.

The housing 2 has a body portion 2A and a handle portion 2B. An electric motor (not shown) that is a drive source and a fan (not shown) that sends cooling air to the electric motor and the like are accommodated in the body portion 2A. The handle portion 2B integrally extends downward from the body portion 2A, and includes a mounting portion 2C at the bottom. The battery pack 3 is detachably attached to the attachment portion 2C. The dimension L in the front-rear direction of the mounting portion 2C is substantially the same as the dimension in the front-rear direction of the battery pack 3 in which four cylindrical cells having an outer diameter (diameter) of 18 mm are arranged and accommodated in the front-rear direction. Here, “substantially the same” means that when the battery pack is attached to the attachment portion 2C, the protruding amount L0 (see FIG. 5) of the battery pack protruding forward from the front end 2D of the attachment portion 2C corresponds to one cell. It means less than the diameter dimension. That is, when a battery pack containing four cells each having an outer diameter of 18 mm is accommodated in the mounting portion 2C, the protruding amount L0 from the front end 2D of the mounting portion 2C to the front is less than the diameter of one cell.

The trigger 4 is provided on the front surface of the upper end portion of the handle portion 2B, and is configured to start / stop the electric motor by turning on / off the power supply from the battery pack 3 to the electric motor.

The output shaft 6 extends in the front-rear direction, and a front end tool (not shown) can be attached to the front end portion. Further, the output shaft 6 is configured to transmit the driving of the electric motor via a speed reduction mechanism and to rotate the tip tool.

The battery pack 3 is shown in FIG. The battery pack 3 controls the overdischarge, overcurrent, etc., with the cell 31 which is a lithium ion secondary battery, the battery case 32 which comprises the whole outer shell, and accommodates the cell 31, the separator 33 attached to the cell 31 A protective substrate 35 to be connected, a terminal portion 34 for electrical connection with the impact driver 1, and a rib 36. The protective substrate 35 controls overcharge when the battery pack 3 is charged.

The cell 31 is a cylindrical secondary battery (lithium battery) having an outer diameter (diameter) of 16 mm and a voltage of 3.6 V and a capacity of 2.5 Ah. The cell 31 is composed of 5 pieces electrically connected in series as one set (1 parallel, 1 para, 1st cell group, 2nd cell group), and the generated 18V voltage power is supplied to the protective substrate. The impact driver 1 can be supplied via the terminal 35 and the terminal portion 34. In the present embodiment, five cells 31 arranged substantially in the front-rear direction are defined as one parameter, and two sets arranged in two layers on the upper and lower sides are electrically connected in parallel (two parallel, two parameters). The capacity of the battery pack 3 in the case of 1 para is 2.5 Ah, and the capacity of the battery pack 3 in the case of 2 para is 5.0 Ah. That is, according to the present invention, it is possible to provide a battery pack 3 having a small capacity and a high capacity. In addition, the connection of two parallel cells is not only a method of connecting a cell set in which a plurality of cells 31 are connected in series as described above, but also a plurality of cell sets in which two cells are connected in parallel. It may be a method to do.

The battery case 32 has cooling holes 32a and 32b that allow cooling air to flow.

The separator 33 is made of a resin such as plastic and plays a role of bundling a plurality of cells 31 at a predetermined position while maintaining a constant interval. In FIG. 2, separators 33 are arranged in such a manner that two parameters are stacked one above the other, and cells 31 are arranged in a staggered manner for each parameter. Specifically, the cells 31 are arranged such that the respective cylindrical axes (center axes) are directed in the left-right direction (the depth direction in FIG. 2), and are adjacent to each other in the front-rear direction among the one-cell cells 31. The axes of any three cells 31 are arranged so as to form vertices of an isosceles triangle having a base angle θ1 of approximately 30 degrees in a side view. In other words, the distance between the two cells 31 that are separated from each other among the three cells 31 is less than the sum of the two outer diameters of the cells 31. Further, among the three cells 31, the adjacent cells 31 (corresponding to the intermediate cell of the present invention) are arranged between two spaced apart cells 31. That is, in the cell 31 for one parameter (the first cell group, the upper cell among the cells arranged vertically), the cells arranged side by side in the front-rear direction are separated and a space (gap) is formed. The cells 31 are arranged in a staggered manner by disposing cells adjacent to each other from at least one of the upper side and the lower side in the space. Similarly, another cell 31 for one parameter (second cell group, the lower cell among the cells arranged vertically) is also arranged in a staggered manner. In other words, in the first cell group and the second cell group made up of a plurality of cells 31 arranged in parallel in the front-rear direction, each cell group is shifted in the vertical direction and constitutes each cell group. The cells are spaced apart from each other in the front-rear direction, and are housed in the battery case 32 so that the cells 31 of the other cell group are located at the spaced positions of one cell group.

The protective substrate 35 is electrically connected to the terminal portion 34 and the cell 31. The protection substrate 35 includes a microcomputer or a protection IC, and monitors and controls the current flowing through the cell 31, the voltage of the cell 31, and the temperature of the cell 31, and protects the cell 31 from overdischarge, overcurrent, overheating, and the like. Specifically, the microcomputer of the protective substrate 35 performs control such as cutting off the current flowing in the cell 31 when overdischarge, overcurrent, or overheat is likely to occur, and preliminarily degrades the quality of the cell 31. Can be prevented. Further, information such as the battery type is transmitted to the impact driver 1 and the charging device at the time of work (during discharging) or charging.

The ribs 36 are disposed above and below the cells 31 (FIG. 2). The rib 36 disposed above the cell 31 is in contact with the upper part of the cell 31 (separator 33) and the lower surface of the protective substrate 35, and the cell 31 (separator 33) and the protective substrate 35 are separated from each other and the protective substrate 35 is removed. It plays a supporting role in the battery case 32. In addition, the rib 36 disposed at the lower portion of the cell 31 supports the lower portion of the cell 31 (separator 33) from the bottom of the battery case 32, and separates the cell 31 (separator 33) and the battery case 32 from each other. No members other than the ribs 36 are disposed in the above-described spaced portion. That is, by arranging the rib 36 in a space where the cell 31 or the like is not arranged in the battery case 32, a cell set (consisting of the cell 31, the separator 33, the protective substrate 35, and the terminal portion 34) is formed in the battery case 32. It can be supported stably. Further, ribs 36 are disposed in the spaces between the cells 31 (spaces between the cells located on the battery case 32 side), and cooling air passages through which the cooling air of the cells 31 passes between the ribs 36 in the left-right direction. 3a is formed (FIG. 3B). The rib 36 may not be provided in the space between the cells, and the cooling air may be passed through the space (the space between the cell 31 and the inner surface of the battery case 32), because the space functions as an air path. The air volume hitting the cell 31 can be increased. In the present embodiment, the rib 36 disposed above the cell 31 is provided integrally with the separator 33, and the rib 36 disposed below the cell 31 is integrally formed so as to protrude from the inner surface of the battery case 32. The rib 36 may be provided integrally with the battery case 32 or the separator 33, or may be a single rib 36 separately. If the battery case 32 and the separator 33 are provided integrally as in the present embodiment, the cells 31 may be assembled in the separator 33 and stored in the battery case 32 with the protective substrate 35 attached to the ribs 36. Assembling of the battery pack 3 can be facilitated.

Operations of the impact driver 1 and the battery pack 103 will be described. Prior to the work, the battery pack 103 is attached to the attachment portion 2C. The attached battery pack 103 is electrically connected to the impact driver 1 via the terminal portion 34 and supplies power. The user drives the electric motor (not shown) by pushing the trigger 4 to rotate the output shaft 6 and the end tool attached to the output shaft 6. The user performs an operation such as attaching a fastener or the like to the workpiece by rotating the tip tool.

FIG. 3 shows the flow of cooling air in the battery pack 3. As shown in FIG. 3A, the cooling air flows around the array of cells 31 to perform cooling. Specifically, when the battery pack 3 is connected to a charger (not shown), cooling air from a fan (not shown) in the charger flows into the battery case 32 through the cooling holes 32 b and around the cells 31. It cools by passing the formed cooling air path 3a, and is discharged | emitted outside through the cooling hole 32a after that. Note that when the battery pack 3 is connected to the impact driver 1, cooling air from a fan (not shown) of the impact driver 1 may be supplied in the same manner as described above. In this case, a hole communicating with the cooling hole 32b may be provided in the mounting portion 2C so that the wind from the fan of the impact driver 1 flows to the cooling hole 32b via the handle portion 2B and the hole.

Therefore, the two cells 31 arranged at the top and the three cells 31 at the bottom are arranged apart from each other in the front-rear direction. In addition, a space is formed in the separated portion and communicates with the cooling air passage 3a. Therefore, the cells 31 other than the uppermost part and the lowermost part can also have a part cooled by the cooling air.

For comparison, a conventional battery pack 103 is shown in FIGS. In FIG.4 and FIG.5, the reference number which added 100 is attached | subjected to the member corresponding to embodiment of this invention, and description is abbreviate | omitted.

As is clear when comparing FIG. 4B and FIG. 3B, the cross section of the cooling air passage 3a in the present invention is larger than the cooling air passage 103a of the conventional battery pack, and the air volume of the cooling air is increased. The effect of increasing the cooling efficiency is obtained. Further, the cooling air passage 3a is also formed between the protective substrate 35 and the cell 31, and the cross section thereof is larger than the cross section of the cooling air passage 103a of the conventional battery pack (FIGS. 3B and 4B). Cooling efficiency is good. In addition, the fact that all the cells 31 have portions that are cooled by the cooling air also contributes to the improvement of the cooling efficiency.

By increasing the cooling efficiency, it is possible to extend the life of the cell 31 or the battery pack 3. Specifically, the cell 31 discharges during operation and generates heat accompanying it. When charging the discharged battery pack 3 by connecting it to a charger, heat can be efficiently discharged to the outside, and the cell 31 can be prevented from overheating and accompanying performance degradation. . In addition, you may make it cool like the fan of a charger with the fan of the impact driver 1 at the time of work.

In addition, when the battery pack 3 of the present invention is attached to the impact driver 1, it is possible to expect an improvement in work efficiency as compared with the conventional battery pack. As is clear when FIG. 3A is compared with FIG. 4A, the longitudinal length of the battery pack 3 according to the present invention is shorter than that of the conventional battery pack 103. In the present embodiment, the longitudinal dimension L3 (see FIG. 2) of the battery case 32 is suppressed to be equal to or less than the sum of the outer diameters of four conventional cells 131 having an outer diameter of 18 mm (outer diameter). 90% or less of the sum of the outer diameters of the cells 31 of 16 mm). This is because the outer diameter of the cells 31 is 16 mm and the cells 31 are arranged in a staggered manner, so that the arrangement length is longer than in the case where the cells 131 are arranged linearly in the front-rear direction as in the prior art. This is because the length can be shortened.

As is clear when FIGS. 1 and 5 are compared, the battery pack 3 of the present invention has a short dimension in the front-rear direction. For this reason, the effect of improving workability can be obtained. When the conventional battery pack 103 is attached to the impact driver 1 (FIG. 5), the battery pack 103 has a long front-rear dimension (front-rear dimension L2 is about 117 mm), and is thus attached to protrude forward. That is, the diameter of one cell 131 or more protrudes forward from the front end 102D of the mounting portion 102C (the protruding amount L0> the size of one cell (18 mm). Therefore, the impact driver 1 and the battery pack 103 are When the battery pack 3 of the present invention is attached to the impact driver 1 (FIG. 1), it is easy to contact the work piece and difficult to handle. Since the battery pack 3 is short (front-rear dimension L1 is about 97 mm), the front-rear dimension of the mounting part 2C is substantially the same, that is, the protruding amount L0 from the front end 2D of the mounting part 2C is less than the diameter dimension of one cell 31. (It hardly protrudes forward from the front end 2D of the mounting portion 2C), and has a compact configuration, which eliminates the above difficulties and improves workability.In other words, a cell having an outer diameter of 16 mm. By arranging 1 cells in a staggered manner, a conventional battery pack with a rated voltage of 14.4V (in the case of a lithium battery) in which four cells 131 having an outer diameter of 18 mm are arranged in the front-rear direction and substantially parallel to the bottom surface of the battery case, and the front-rear dimensions However, the compact 18V battery pack 3 can be constructed.

On the other hand, regarding the vertical dimension of the battery pack, the vertical dimension H2 of the conventional battery pack 103 shown in FIG. 5 is about 69 mm, whereas the vertical dimension H1 of the battery pack 3 of the present invention shown in FIG. It will be slightly larger. However, in the conventional battery pack 103 of FIG. 5, the two cells 131 positioned in the foreground are arranged in the vertical direction in order to suppress the front-rear dimension (the protruding amount L0), and other cells (second and third rows from the front) are arranged. If the cell is disposed on the lower side of the cell, the height dimension is increased by at least the cell outer diameter (18 mm), and at least the vertical dimension H2 is 87 mm (69 mm + 18 mm). In the case of a cell having an outer diameter of 16 mm, since three cells are arranged in the vertical direction, the cell portion is 48 mm (16 × 3), the remaining portion is 33 mm, and the vertical dimension is 81 mm. Here, with respect to the remaining portion, in the battery pack 3 of the present invention, the vertical cell portion is two and a half (half in the radial direction of adjacent cells in the vertical direction overlaps), and 40 mm (16 × 2 + 8). Since the portion is 33 mm (73-40), the dimensions of the remaining portion are the same as those of the present invention. On the other hand, the battery pack 3 of the present invention arranges the cells in a zigzag shape (four layers parallel to the front-rear direction), so that the vertical dimension is as much as the cells overlap in the vertical direction with respect to the conventional arrangement. Can be suppressed.

The battery pack 3 may have a compact configuration in which the inner dimension L3 in the front-rear direction is suppressed to 90% or less of the outer diameter of five cells 31 (four or less outer diameters of the conventional cell 131). I can do it. In addition, since the cells 31 are spaced apart via the ribs 36 and the cells 31 can be cooled by the spaces formed in the separated portions, the cells 31 can be efficiently cooled. Further, by forming the separation portion, the number of cells 31 facing the space can be increased, and the cooling efficiency can be improved. That is, overheating of the battery pack 3 can be prevented and the life can be extended.

Further, since the cells 31 are arranged so as to overlap a plurality of layers, the battery pack 3 having the battery case 32 having a short inner dimension L3 in the output shaft direction (front-rear direction) can be provided.

In addition, the battery pack 3 of the present invention has a cell diameter of 16 mm and a small size and a high capacity (2.5 Ah). In the case of 5-cell series, a battery pack of 18 A and 5.0 Ah can be obtained, and a battery pack having a high capacity while being small and an electric tool using the battery pack can be provided.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of these components and the like, and such modifications are within the scope of the present invention.

The arrangement of the cells 31 is an example and is not limited to the present embodiment. For example, the cell 31 can be 18 mm instead of 16 mm in outer diameter. Even in this case, it is possible to obtain a battery case 32 in which the front-rear direction is shorter than when the cells 31 are arranged in a straight line by arranging the arrangement in a staggered manner as in the present embodiment. Moreover, the dimension in the vertical direction can also be shortened compared to the case where the cells are arranged linearly in the front-rear direction and the vertical direction.

In addition, although the description has been given of the five-cell configuration of the cells 31 arranged substantially in the front-rear direction, the present invention is not limited to such an embodiment. It is good also as groups other than five, such as six 1 para. Moreover, it is not necessary to make one set arranged in the front-rear direction, and a set of arbitrary cells 31 may be used. For example, in FIG. 2, two vertically adjacent 2 × 2 rows and one other may be combined.

In the present embodiment, the cooling air passage 3a is formed around the cell 31 using the ribs 36, but the present invention is not limited to this embodiment. For example, the separator 31 may be used to separate the cell 31 from the protective substrate 35 and the battery case 32 to form the cooling air passage 3a.

In the present embodiment, the axes of any three adjacent cells 31 in one para form an isosceles triangle vertex having a base angle θ1 of approximately 30 degrees in side view, but the present invention is limited to this form. Is not to be done. Of the three cells 31, two facing the cooling air passage 3a may be separated from each other.

<Modification> A modification of the present invention is shown in FIG. In the present invention, as shown in each modification, various cell arrangements are possible. In FIG. 6, members similar to those in the present embodiment are denoted by a multiple of 100, and description thereof is omitted. The left side of the figure shows an array when 10 cells are used (5 sets × 2, 2 parameters), and the right side is an array when 5 cells are used (5 sets × 1, 1 parameter). Show.

FIG. 6A shows an array of cells 31 corresponding to the embodiment of the present invention. Thus, in the case of two parallaxes, an efficient cooling and a compact configuration are realized by a configuration in which four layers are arranged in parallel in the front-rear direction and the cells 31 are arranged with a space therebetween. As shown in FIG. 6 (f), the same effect can be obtained by arranging a staggered arrangement, that is, an arrangement of two layers parallel to the front-rear direction, even in one parameter.

The present invention is not limited to the embodiment of the present invention. As shown in FIGS. 6B and 6C, in the case of 2 parameters, a cell array composed of three layers parallel to the front-rear direction is also possible. In FIG. 6B, the axes of any three adjacent cells 231 are arranged to form vertices of an isosceles triangle having a base angle θ2 of less than 60 degrees in a side view. In this case, although the inner dimension and the total length of the battery case 232 in the front-rear direction are longer than those in FIG. 6C, the battery case 232 is shorter than the conventional arrangement in FIG. Since a space is formed, highly efficient cooling can be realized. Moreover, the vertical dimension can be suppressed by the amount of overlapping of the cells in the vertical direction. Further, even in one parameter, the same effect can be obtained by arranging the plurality of layers parallel to the front-rear direction (FIGS. 6G and 6H).

6 (d), (e), (i), and (j), the arrays are arranged in a line in the front-rear direction. However, by using a cell with an outer diameter of 16 mm without using a cell with an outer diameter of 18 mm, The internal dimensions and the total length in the front-rear direction of 432, 532, 932, and 1032 are shortened. Thereby, each battery pack is made into a compact structure, and the workability | operativity at the time of mounting | wearing with the impact driver 1 is implement | achieved. In particular, the battery pack 503 in FIG. 6E has an effect of suppressing the height as compared with the battery pack 403 by shifting the arrangement of the cells 531. That is, according to the battery pack 503, the height dimension (vertical dimension) can be suppressed even if the longitudinal dimension is the same as the longitudinal dimension L2 of the conventional battery pack 103.

The matters described in the above embodiments and modifications need not be explicitly exemplified, and can be applied to, for example, a power tool having a drive unit using an FET element when driving a motor, such as a brushless type motor. It is obvious to those skilled in the art, and it is obvious to those skilled in the art that the present invention is not limited to the power tool using a motor. For example, it is also suitable to employ a work light / lantern or the like, and the effects of the present invention can be achieved by performing the same control as in the above embodiment.

The electric tool to which the battery pack for the electric tool of the present invention is attached and removed includes the above-described impact driver 1, grinder (grinding tool), sander (polishing tool), nailing machine, screw driving machine, tacker, dust collector ( Cleaners), blowers (fans, blowers), pumps, high pressure washers, chain saws (cutting tools), gardening tools (mowing machines, plant clippers), tillers, etc. That is, the electric device of the present invention includes a device that rotates the electric motor with the electric power of the battery pack and converts the rotational motion into at least one of the reciprocating motion and the rotational motion of the operating member. The power tool of the present invention includes a torch light (flashlight) and the like. That is, the electric tool of the present invention includes a lighting device that converts electric energy supplied from the battery pack into light energy.

The cells of the present invention include lithium ion battery cells, nickel metal hydride battery cells, lithium ion polymer battery cells, nickel cadmium battery cells, and the like.

DESCRIPTION OF SYMBOLS 1 ... Impact driver, 2 ... Housing, 2A ... Body part, 2B ... Handle part, 2C ... Mounting part, 3 ... Battery pack, 4 ... Trigger, 6 ... Output shaft, 31 ... Cell, 32 ... Battery case, 33 ... Separator 34 ... Terminal part, 35 ... Protective substrate, 36 ... Rib

Claims (23)

A plurality of cells, and a battery case containing the plurality of cells,
Each of the plurality of cells has a diameter of 16 mm and a capacity of 2.5 Ah, and all the cells are electrically connected in series and are accommodated in the battery case so as to be arranged in the front-rear direction. Battery pack. A plurality of cells, and a battery case containing the plurality of cells,
Each of the plurality of cells has a diameter of 16 mm and a capacity of 2.5 Ah. The plurality of cells are electrically connected to the first cell group electrically connected in series and the first cell group separately from the first cell group. A second group of cells connected in series,
The battery pack, wherein the first cell group and the second cell group are electrically connected in parallel to each other to have a capacity of 5.0 Ah and are accommodated in the battery case so as to be arranged in the front-rear direction. . The plurality of cells constitutes a first layer aligned in parallel with the front-rear direction and a second layer aligned in parallel with the front-rear direction above the first layer,
The plurality of cells constituting the first layer and the second layer are separated from each other in the front-rear direction, and the cells of the other layer are located at the separated positions of one layer. The battery pack according to claim 1 or 2. An electric tool comprising a mounting portion to which the battery pack according to any one of claims 1 to 3 can be mounted. A motor,
A body portion for housing the motor, a handle portion having one end connected to the body portion, and a mounting portion provided at the other end of the handle portion to which a battery pack for housing a plurality of cells is mounted. A housing, and
The dimensions of the mounting portion in the front-rear direction are substantially the same as the dimensions in the front-rear direction of the battery pack that accommodates four cells having a diameter of 18 mm in parallel with the front-rear direction, and the cell diameter is 16 mm. An electric tool characterized by being configured to be substantially the same as the longitudinal dimension of the battery pack containing the five cells. When the battery pack is mounted on the mounting portion, the protruding amount of the battery pack from the front end of the mounting portion to the front is the battery in which five cells having a cell diameter of 18 mm are accommodated in parallel in the front-rear direction. In the case of a pack, the size is equal to or larger than the size of one cell, and in the case of the battery pack that accommodates five cells having a diameter of 16 mm, the size is smaller than the size of one cell. The power tool according to claim 5. The gap according to claim 5 or 6, wherein a gap is provided between the cells arranged in parallel in the front-rear direction, and the cells are disposed in the gap from at least one of the upper side and the lower side. Electric tool. The power tool according to claim 7, wherein the plurality of cells are arranged in a staggered manner when the cells are viewed in the axial direction. A battery pack having a plurality of cells, all of which are electrically connected in series, and a battery case that houses the plurality of cells,
The plurality of cells are arranged in the front-rear direction with a first cell group housed in the battery case so as to line up in the front-rear direction of the battery case, and shifted upward or downward with respect to the first cell group. And a second cell group accommodated in the battery case,
The battery pack, wherein the first cell group and the second cell group are electrically connected in series. The battery pack according to claim 9, wherein the plurality of cells constituting the first cell group and the second cell group are arranged in a staggered manner when viewed in the axial direction of the cells. A battery pack having a plurality of cells and a battery case that houses the plurality of cells,
The plurality of cells are arranged in a staggered manner when viewed in the axial direction of the cells, and are arranged so that a space is formed between the cells arranged in the front-rear direction of the plurality of cells.
A battery pack, wherein a cooling air passage for the cell is formed between the space and an inner surface of the battery case. A battery pack having a plurality of cells and a battery case that houses the plurality of cells,
The plurality of cells are arranged in a staggered manner when viewed in the axial direction of the cells, and are arranged so that a space is formed between cells arranged in the front-rear direction of the plurality of cells,
The battery case has a rib protruding upward from the inner surface thereof,
The battery pack, wherein the rib is located in the space and forms a cooling air passage for the cell by the rib. A battery pack having a plurality of cells, a holding member that holds the plurality of cells, a protective substrate that is disposed above the holding member and monitors the state of the plurality of cells, and a battery case that houses them. There,
The plurality of cells are staggered when viewed in the axial direction of the cells,
The holding member has a rib positioned in a space in the battery case where the plurality of cells are not positioned, and the protection substrate is supported by the rib. An electric tool comprising a mounting portion to which the battery pack according to any one of claims 9 to 13 can be mounted. A plurality of cells, and a battery case that can be attached to and detached from a power tool having an output shaft, and in which the plurality of cells are arranged so that the axes of the plurality of cells are parallel to each other,
At least two of the plurality of cells are arranged parallel to the output axis direction,
At least one of the plurality of cells is an intermediate cell adjacent to and common to the two cells;
The axis of the intermediate cell is located between the axis of the two cells when projected from a direction orthogonal to the output axis and the axes of the plurality of cells;
The distance between the axes of the two cells is less than the sum of the outer diameters of the two cells;
Connecting the axis of the two cells and the axis of the intermediate cell forms a triangle having at least one interior angle of less than 60 degrees when viewed in the axial direction of the plurality of cells. Battery pack for tools. The battery pack for an electric tool according to claim 15, wherein the triangle is an isosceles triangle having a base angle of less than 60 degrees. The electric tool according to claim 15 or 16, wherein, when viewed in the axial direction, the line segments connecting the axes of the plurality of cells are arranged to form a plurality of rows parallel to the output shaft. Battery pack. The battery pack for an electric tool according to any one of claims 15 to 17, wherein the plurality of cells are arranged in a staggered manner when viewed in the axial direction. Multiple cells,
A battery case that is detachable from an electric tool having an output shaft and arranges the plurality of cells so that the axes of the plurality of cells are parallel to each other, and
The battery pack for a power tool, wherein the plurality of cells and the battery case are arranged so as to be separated from each other via a rib. A plurality of cells, and a battery case that can be attached to and detached from an electric tool having an output shaft, and the plurality of cells are arranged so that the axes of the plurality of cells are parallel to each other,
At least two of the plurality of cells are separated from each other via a rib. Multiple cells,
A protective substrate for controlling current flowing in the plurality of cells;
A battery case that is detachable from an electric tool having an output shaft and arranges the plurality of cells so that the axes of the plurality of cells are parallel to each other, and
The battery pack for a power tool, wherein the protective substrate and the plurality of cells are separated from each other via a rib. The power tool battery according to any one of claims 15 to 21, wherein an inner dimension in the output shaft direction is 90% or less of a total of outer diameters of five of the plurality of cells. pack. An electric motor;
An output shaft to which the drive of the electric motor is transmitted;
A housing for housing the electric motor,
23. An electric tool characterized in that the housing is detachable from the battery pack for an electric tool according to any one of claims 15 to 22.

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