JP2019021594A - Battery pack and electrical machine using battery pack - Google Patents

Abstract

To improve the lead-out structure of a connection tab from battery cells stacked by means of a separator in a battery pack.SOLUTION: In a battery pack having cell units, consisting of five battery cells on the upper stage side and the lower stage side, and provided with two positive electrode terminals and two negative electrode terminals, the output from an upper stage side cell unit is connected with a circuit board 150 by using lead-out tubs 461a, 466a, and the output from a lower stage side cell unit is connected with the circuit board 150 by using lead-out tubs 471a, 476a. When defining four regions by dividing the front and back and the left and right of the circuit board 150 by division lines A1, A2, one lead-out tub from the cell unit and one of the positive electrode terminals (162, 172) or negative electrode terminals (167, 177) are placed in each region. With such an arrangement, wiring from the lead-out tubs 461a, 466a, 471a, 476a to the positive electrode terminals (162, 172) or the negative electrode terminals (167, 177) can be carried out efficiently without crossing.SELECTED DRAWING: Figure 14

Description

  The present invention relates to an electric device having a load such as a motor and lighting, and a battery pack for supplying power to such an electric device.

  Electrical devices such as electric tools are driven by a battery pack using a secondary battery such as a lithium ion battery, and the electrical devices are becoming cordless. For example, in a hand-held power tool that drives a tip tool by a motor, a battery pack that contains a plurality of secondary battery cells is used, and the motor is driven by electric energy stored in the battery pack. The battery pack is configured to be attachable to and detachable from the electric tool body. When the voltage drops due to discharge, the battery pack is removed from the electric tool body and charged using an external charging device.

  Cordless power tools and electrical devices are required to have a predetermined operating time and a predetermined output, and higher output and higher voltage have been achieved as the performance of the secondary battery is improved. In addition, battery packs with various voltages have been commercialized as electric devices using battery packs as power sources have been developed. Usually, the output voltage of the battery pack is fixed. However, in Patent Document 1, a plurality of battery units are provided in a housing that accommodates the battery, and the connection means determines whether to output them as a series connection or a parallel connection. There has been proposed a power supply device for an electric device that can be selected and adapted to devices of different voltages.

JP 2014-17554 A

  It is complicated for a user to prepare a plurality of types of battery packs when using a plurality of electric devices, and it is desired to realize an easy-to-use battery pack corresponding to electric devices having different voltages by switching voltages. ing. Moreover, it has been desired to realize a voltage switching type with a battery pack that can be easily attached to an electric device, rather than a power supply device that is separate from the electric device main body as in Patent Document 1.

The present invention has been made in view of the above background, and an object of the present invention is to provide a battery pack that can switch output voltages and can be shared between electrical devices having different voltages, and an electrical device using the battery pack. It is in.
Another object of the present invention is to provide a battery pack having an improved structure for pulling out a connection tab from a battery cell stacked by a separator in the battery pack to a circuit board, and an electric device using the battery pack.
Still another object of the present invention is to provide a battery pack capable of efficiently wiring a wiring pattern between a connection tab from a battery cell and a connection terminal on a circuit board fixed to the upper portion of the separator, and an electric power using the battery pack To provide equipment.

The typical features of the invention disclosed in the present application will be described as follows.
According to one aspect of the present invention, there is provided a battery pack having first and second cell units in which a plurality of battery cells are connected in series, each having a positive electrode terminal pair and a negative electrode terminal pair on the left and right sides of the circuit board. The positive electrode terminal pair and the negative electrode terminal pair each include two terminal parts whose mounting parts to the circuit board are separated in the front-rear direction, and the terminal parts included in the positive electrode terminal pair and the negative electrode terminal pair One of them is connected to the first cell unit, and the other is connected to the second cell unit, and a pattern wiring for connecting the terminal components to the output terminals of the first and second cell units is provided on the circuit board. To form. At this time, the connection points of the lead tabs to the output terminals of the first and second cell units and the pattern wiring are arranged in four regions divided by the left and right and front and rear center lines of the four terminals, respectively. A drawer tab having the same potential as that of the component is drawn out into the same area among the four areas, and the terminal part and the drawer tab located in the same area are connected in the same area by pattern wiring. That is, the positive electrode terminal pair includes two terminal parts whose attachment parts to the circuit board are separated from each other in the front and back, and the negative electrode terminal set includes two terminal parts whose attachment parts to the circuit board are separated from each other in the front and rear. In a battery pack in which one combination of terminal components included in the negative electrode terminal set is connected to the first cell unit and the other combination is connected to the second cell unit, the front and rear and the left and right sides of the circuit board are divided into two parts. When the first to fourth areas were defined, one extraction tab from the output terminal of the first or second cell unit and one terminal component were arranged in each area.

  According to another feature of the present invention, the drawer tab is provided adjacent to the four sides of the circuit board, and the slit-like through hole formed in the circuit board is penetrated from the back surface side to the front surface side. And is arranged so that the longitudinal direction of the slit-like through hole is parallel to the direction in which the adjacent sides extend. A plurality of battery cells have parallel axes, and have non-conductive separators that hold the battery cells in two upper and lower stages so that the directions of adjacent cells are alternately reversed. Arranged on the top surface. A drawer plate with two drawer tabs provided parallel to the short side of the circuit board extends from the terminal of the battery cell arranged on the lower side to the short side of the separator and extends upward to reach the circuit board. It is a bent body of a thin metal plate. In this way, the pull-out tabs on the positive side of the first and second cell units are pulled out in the region where the positive electrode terminal pair of the circuit board is arranged, and the first in the region where the negative electrode terminal pair of the circuit board is arranged. And the drawer tab on the negative electrode side of the second cell unit was pulled out. The drawer tab is a part formed by bending the end part of the drawer plate from the horizontal direction to the vertical direction, and a plurality of tab holding parts for holding the part of the drawer tab bent in the vertical direction are formed on the upper part of the separator. Is done.

  According to still another feature of the present invention, the terminal component includes a base portion extending upward from the leg portion and an arm portion set extending forward from the base portion, and the front terminal arm and the rear terminal arm. When the parts are arranged side by side on the upper and lower sides and the battery pack is mounted on the low-voltage electric tool body, the upper arm part and the lower arm part group are common to the power terminals of the low-voltage electric tool body. When the battery pack is attached to the high-voltage power tool body, only one of the upper arm set and the lower arm set is connected to the power terminal of the high-voltage power tool body and not to the power terminal. The other terminal is short-circuited. In addition, the lead plate includes a terminal surface extending in parallel with the surface on which the electrode of the battery cell is disposed, a connection surface that is bent in a direction perpendicular to the terminal surface and disposed on the short side of the separator, and a connection surface It includes a drawer tab formed on the top. A fuse portion having a narrow width is formed on a part of the connection surface, and the fuse portion is blown when an excessive current flows for a predetermined time or more to cut off the electrical connection between the terminal surface and the extraction tab. The fuse portion may be formed on a drawer tab fixed to the positive side output of the first and second cell units. An extended surface for heat dissipation may be further connected to the drawer tab where the fuse portion is formed.

  According to the present invention, it is possible to automatically obtain an appropriate output voltage by simply mounting on an electric device body without depending on a mechanical switch mechanism for switching the output voltage. It is now possible to share battery packs. In addition, since the voltage-switchable battery pack can be connected to a conventional low-voltage electrical device body as it is, it can be used for a high-voltage electrical device body while maintaining compatibility with the conventional electrical device body. High battery pack can be realized. Furthermore, since the connection tab routing structure from the battery cells stacked in the battery pack separator has been improved, the four connection tabs from the drawer plates from the two cell units are fixed to the circuit board fixed to the upper part of the separator. Can be connected directly. Also, since the connection tabs to be connected are arranged on the circuit board so as to be close to the four power terminals of the positive electrode terminal pair for discharging and the negative electrode terminal pair, it is necessary to alternately cross the wiring patterns connected to the power terminals. Thus, the wiring pattern can be efficiently arranged on the circuit board.

It is a figure for demonstrating the mounting condition to the electric tool of the battery pack which concerns on this invention. It is a perspective view which shows the shape of the battery pack mounting part 10 of the electric tool main body 1 of FIG. 1 is a perspective view of a battery pack 100 according to an embodiment of the present invention. FIG. 4 is a developed perspective view of the battery pack 100 of FIG. 3. FIG. 5 is an exploded perspective view for explaining a battery cell stack state and a wiring method using the separator 445 of FIG. 4. It is a figure which shows the single-piece | unit shape of the positive electrode terminal pair (162 and 172) and negative electrode terminal pair (167 and 177) used for discharge among the electric power terminals of FIG. FIGS. 5A and 5B are diagrams showing a single shape of the power terminals (161 and 171, 162 and 172, and 167 and 177) in FIG. 4, where (1) is an overall perspective view and (2) is a perspective view of the upper terminal component 260. FIG. (3) is a perspective view of the lower terminal component 280. It is a figure for demonstrating the connection condition of the electric equipment main body and the power terminal of the battery pack 100, (1) shows the connection circuit of the state connected to the electric tool main body 30 of a present Example, (2) is conventional. The connection circuit connected to the electric tool main body 1 is shown. (1) is a perspective view of the terminal portion 50 of the electric power tool main body 30 of this embodiment, (2) is a perspective view of the short bar 59 alone, and (3) is a power terminal of the terminal portion 50 and the battery pack 100. It is a figure which shows the connection method. (1) is a perspective view of the terminal part 20 of the conventional electric tool main body 1, and (2) is a figure which shows the connection condition of the terminal part 20 and the electric power terminal of the battery pack 100. FIG. It is a figure which shows the single-piece | unit shape of the signal terminal component 240 of a present Example, Comprising: (1) is the perspective view seen from the upper left front, (2) is the perspective view seen from the lower right front. It is a figure which shows the fixation condition to the circuit board 150 of the several signal terminal component 240, (1) is the figure seen from the front, (2) is the figure which looked at the signal terminal component 240 from the left, ( 3) is a bottom view seen from the lower side of (1). It is a side view of the separator 445 after assembling the components of FIG. 5, (1) is a right side surface, (2) is a left side view. It is a perspective view which shows the state which fixed the circuit board 150 to the separator 445 (the perspective view seen from the upper left front). It is a perspective view which shows the state which fixed the circuit board 150 to the separator 445 (the perspective view seen from the upper right back). FIG. 16 is a view for explaining a connection method of the battery pack 100 to the drawer plates 461, 466, 471, 476 and the positive terminals (162, 172) and the negative terminals (167, 177). FIGS. 16A and 16B are diagrams showing the connection terminal group of FIG. 15 and a substrate cover 180 disposed around the connection terminal group, wherein FIG. (3) is a front view. FIG. 18 is a diagram of the substrate cover 180 alone in FIG. 17, (1) is a perspective view seen from the upper left front, (2) is a perspective view seen from the lower right front, and (3) is a front view. It is a figure which shows the connection terminal group of FIG. 15, and the board | substrate cover 180 arrange | positioned around it, (1) is a top view, (2) is a rear view. It is a figure which shows the connection terminal group of FIG. 15, and the board | substrate cover 180 arrange | positioned around it, (1) is a right view, (2) is a left view. FIG. 6 is a diagram for explaining a situation where device-side terminals are inserted into a substrate cover 180. (1) is a perspective view of the upper case 110 in FIG. 3, and (2) is an arrow view of the substrate cover 180 and the terminal portion viewed from the direction of arrow B in (1). It is a figure for demonstrating the coating method of resin to the circuit board 150. FIG. FIGS. 24A and 24B are perspective views showing a terminal portion 200 according to the second embodiment of the present embodiment. (1) (3) is a perspective view from another angle of the terminal part 200, (2) is a front view. (1) It is a perspective view of the terminal part 50A which concerns on the 4th Example of this invention, (2), (3) is a perspective view of a power terminal part. It is a schematic circuit diagram of the battery pack and electric equipment main body which concerns on the 4th Example of this invention. It is a figure for demonstrating the operation | movement of the short bar connection switch 59d in FIG. 27, and the operation timing of the trigger switch 34 and a motor. It is a figure which shows the terminal holder 500 for 18V which concerns on the 5th Example of this invention, (1) is a perspective view, (2) is a front view. It is a figure which shows the terminal holder 500 of FIG. 29, (1), (3) is a perspective view, (2) is a front view. FIG. 30 is a partial side view showing a state in which the terminal holder 500 of FIG. 29 is connected to a conventional battery pack 15. It is a figure which shows the shape of the terminal holder 550 for 36V which concerns on the 5th Example of this invention, (1) is the perspective view seen from the bottom, (2) is a left view. It is a figure which shows the terminal holder 550 of FIG. 32, (1) is a front view, (2) is a bottom view, (3) is a top view. (1) is a side view of the terminal holder 550 in FIG. 32, and (2) is a side view in which the illustration of the side wall portion of the substrate cover 180 is omitted from the view in (1). (1) is a right side view showing a state in which the terminal holder 550 is attached to the battery pack 100, and (2) is a cross-sectional view of the CC section of (1). It is a figure which shows the terminal part 650 which concerns on the modification of a 5th Example, (1) is sectional drawing of the part corresponded to the DD part of FIG. 35, (2) is the elements on larger scale of (1). FIG. 36 is a view showing a modified example of fixing the terminal portion 650 of FIG. 36 to the substrate cover 680, (1) is a cross-sectional view of a portion corresponding to the DD portion of FIG. 35, and (2) is a view of (1). It is a single figure of the terminal part 650, (3) is a left view of the terminal part 650. (1) is a modification of the terminal unit 650 of FIG. 36, and (2) is a left side view of the terminal unit 650. It is a figure which shows the terminal part 650B which concerns on the further modification of a 5th Example, (1) is a front view, (2) is a left view, (3) is the connection by the side of the battery pack 100 It is a left view of the terminal part 650B in a fitting state with a terminal. It is a perspective view for demonstrating the mounting condition of the battery pack 860 of the electric tool of 6th Example. It is a figure for demonstrating the mounting condition to the electric tool of the battery pack which concerns on a 6th Example. It is a perspective view which shows the connection state to the electric tool main body of an electric power terminal, (1) shows the state which mounts the battery pack 860 in the electric tool main body 801 for 18V, (2) shows the electric tool main body 830 for 36V. Shows a state where the battery pack 860 is mounted. It is a figure for demonstrating the condition at the time of mounting the battery pack 860 on the 36V specification electric tool main body 830. FIG. It is a figure for demonstrating the condition at the time of mounting the battery pack 860 on the electric tool main body 801 of 18V specification. FIG. 11 is a top view showing the terminal arrangement on the battery pack 860 side and the terminal shape and arrangement of the electric power tool main body 830.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals, and repeated description is omitted. In this specification, an electric tool that operates on a battery pack will be described as an example of an electric device. The front, rear, left, and right directions on the main body side of the electric tool are directions shown in FIG. The front, rear, left, right, and up and down directions when viewed in FIG. 3 are described as the directions shown in FIG. 3 with respect to the mounting direction of the battery pack. For the convenience of explanation, the battery pack mounting direction is described as a direction based on the situation in which the battery pack side is moved without moving the electric power tool main body side.

  FIG. 1 is a view for explaining a mounting state of a battery pack according to the present embodiment to an electric tool. The electric tool which is one form of electric equipment has a battery pack, and drives a tip tool and work equipment using the rotational driving force by a motor. Although various types of electric tools are realized, the electric tool main bodies 1 and 30 shown in FIG. 1 are both called impact tools. The power tool main bodies 1 and 30 are tools that perform tightening work by applying a rotational force or an axial striking force to a tip tool such as a bit or a socket wrench (not shown). These power tool main bodies 1 and 30 are provided with housings 2 and 32 which are outer frames forming an outer shape, and handle portions 3 and 33 are formed in the housing 2. Trigger-like operation switches 4 and 34 are provided in the vicinity of the handle portions 3 and 33 where the index finger hits when the operator grips the battery pack 15 and the battery packs 15 and 33 are provided below the handle portions 3 and 33. Battery pack mounting portions 10 and 40 for mounting 100 are formed.

  The electric tool body 1 is a conventional electric device using a battery pack 15 having a rated voltage of 18V. The battery pack 15 is a conventional battery pack, and can be mounted on the battery pack mounting portion 10 of an 18V-compatible electric device (power tool main body 1) as indicated by the arrow a. In the battery pack 15, only one set of cell units formed by serially connecting five lithium ion battery cells with a rating of 3.6 V is accommodated, or two sets of such cell units are accommodated to each other. Connected in parallel. Here, the “cell unit” is a unit in which a plurality of battery cells are electrically connected. As an example of the “cell unit”, a connected body in which a plurality of battery cells are connected in series, or a plurality of battery cells in parallel. A connected body and a connected body in which a plurality of battery cells are connected in series and in parallel are included. The voltage 18V is sometimes referred to herein as a low voltage in the sense that it is a relatively low voltage. Similarly, the electric power tool main body 1 or the electric device main body having a rated voltage of 18 V may be referred to as a low voltage electric tool main body or a low voltage electric device main body, respectively. Similarly, the battery pack 15 having a nominal voltage of 18V may be referred to as a low voltage battery pack.

  The electric tool main body 30 is an electric equipment main body having a rated voltage of 36V, and the battery pack 100 capable of outputting 36V is mounted on the battery pack mounting portion 40 as indicated by an arrow b1. The voltage 36V is sometimes referred to as a high voltage in the sense that it is a relatively high voltage. Similarly, the power tool main body 30 or the electric equipment main body with the rated voltage of 36 V may be referred to as a high voltage electric tool main body or a high voltage electric equipment main body, respectively. Two sets of cell units in which five 3.6V lithium ion battery cells are connected in series are accommodated in the battery pack 100, and 18V output and 36V output can be obtained by changing the connection method of the two sets of cell units. It became possible to switch both. In this embodiment, the battery pack 100 is configured to be compatible with two voltages so that low voltage and high voltage can be output, so that the battery pack 100 is also mounted on the electric tool body 1 compatible with 18V as indicated by an arrow b2. It can be attached to the electric tool main body 30 corresponding to 36V as indicated by an arrow b2. As described above, the battery pack 100 capable of outputting a low voltage and a high voltage may be referred to as a voltage variable battery pack herein. In order to attach the battery pack 100 to the power tool main bodies 1 and 30 having different voltages as indicated by arrows b1 and b2, the shape of the rail portions and terminal portions of the battery pack attachment portions 10 and 40 are substantially the same. It is important that the output voltage of the battery pack 100 can be switched. At this time, it is important to ensure that the output voltage of the battery pack 100 corresponds to the rated voltage of the electric device main body or the power tool main body to be mounted so as not to cause a voltage setting error.

  FIG. 2 is a perspective view showing the shape of the battery pack mounting portion 10 of the electric power tool body 1. The electric power tool main body 1 shown here is an impact driver, and is provided with a handle portion that extends downward from the body portion of the housing 2, and a battery pack mounting portion 10 is formed below the handle portion. A trigger switch 4 is provided on the handle portion. An anvil (not shown) as an output shaft is provided on the front side of the housing 2, and a tip tool holding portion 8 for mounting the tip tool 9 is provided at the tip of the anvil. Here, a plus driver bit is attached as the tip tool 9. In addition to electric tools, in general electrical equipment using battery packs, a battery pack mounting portion 10 corresponding to the shape of the battery pack to be mounted is formed, and a battery pack that does not match the battery pack mounting portion 10 is mounted. Configure so that it cannot. In the battery pack mounting portion 10, rail grooves 11a and 11b extending in parallel in the front-rear direction are formed in inner wall portions on both the left and right sides, and a terminal portion 20 is provided therebetween. The terminal portion 20 is manufactured by integral molding of a non-conductive material such as a synthetic resin, and a plurality of metal terminals such as a positive electrode input terminal 22, a negative electrode input terminal 27, and an LD terminal (abnormal signal terminal) 28 are cast therein. It is. The terminal portion 20 is formed with a vertical surface 20a that serves as an abutment surface in the mounting direction (front-rear direction) and a horizontal surface 20b. The horizontal surface 20b is adjacent to the upper surface 115 (described later in FIG. 3) when the battery pack 100 is mounted. , It becomes the opposite surface. On the front side of the horizontal surface 20b, a curved portion 12 that contacts a raised portion 132 (described later in FIG. 3) of the battery pack 100 is formed, and a protruding portion 14 is formed in the vicinity of the left and right center of the curved portion 12. The projecting portion 14 also serves as a boss for screwing the housing of the electric power tool main body 1 formed in two parts in the left-right direction, and also serves as a stopper for restricting relative movement in the mounting direction of the battery pack 100.

  FIG. 3 is a perspective view of the battery pack 100 according to the embodiment of the present invention. The battery pack 100 can be attached to and detached from the battery pack mounting portions 10 and 40 (see FIG. 1). The battery pack 100 has a low voltage (here, 18V) depending on the terminal shape of the power tool body 1 or 30 side. The output of the high voltage (here 36V) is switched automatically. In addition, the shape of the mounting portion of the battery pack 100 is the same as that of the conventional battery pack 15 in order to provide compatibility with the conventional battery pack 15 for 18 V rating (see FIG. 1). The casing of the battery pack 100 is formed by a lower case 101 and an upper case 110 that can be divided in the vertical direction. The lower case 101 and the upper case 110 are made of a member that does not conduct electricity, such as a synthetic resin, and are fixed to each other by four screws (not shown). The upper case 110 is formed with a mounting mechanism in which two rails 138 a and 138 b are formed to be attached to the battery pack mounting portion 10. The rails 138a and 138b are formed so that the longitudinal direction is parallel to the mounting direction of the battery pack 100 and protrudes in the left-right direction from the left and right side surfaces of the upper case 110. The front end portions of the rails 138a and 138b are open ends, and the rear end portions are closed ends connected to the front side wall surface of the raised portion 132. The rails 138a and 138b are formed in a shape corresponding to the rail grooves 11a and 11b (see FIG. 2) formed in the battery pack mounting portion 10 of the electric power tool body 1, and the rails 138a and 138b are fitted with the rail grooves 11a and 11b. In the combined state, the battery pack 100 is fixed to the electric tool main body 30 by being locked by locking portions 142a (right-side locking portions, which cannot be seen in FIG. 3) and 142b, which are latch claws. When the battery pack 100 is removed from the electric tool body 1, the latch portions 142a and 142b are moved inward by pushing the latches 141 on the left and right sides, and the latched state is released. 100 is moved to the opposite side to the mounting direction.

  A flat lower step surface 111 is formed on the front side of the upper case 110, and an upper step surface 115 formed higher than the lower step surface 111 is formed near the center. The lower step surface 111 and the upper step surface 115 are formed in a staircase shape, and the connecting portion thereof is a stepped portion 114 that becomes a vertical surface. A front portion of the upper step surface 115 from the stepped portion 114 becomes the slot group arrangement region 120. In the slot group arrangement region 120, a plurality of slots 121 to 128 extending rearward from the front stepped portion 114 are formed. The slots 121 to 128 are notched portions having a predetermined length in the battery pack mounting direction, and the electric tool main bodies 1 and 30 or an external charging device ( A plurality of connection terminals (which will be described later with reference to FIG. 4) that can be fitted to the device side terminals (not shown) are provided. The slots 121 to 128 have notches formed on the upper surface and the vertical surface parallel to the mounting direction so that the terminal on the power tool main body side can be inserted from the lower surface 111 side. In addition, an opening 113 that continuously opens in the lateral direction is formed below the slots 121 to 128 and between the lower step surface 111. In the opening 113, the left and right sides of a vertically extending rib-shaped vertical wall portion 185 a disposed in the center are formed in a planar shape, and the planar portion is formed by the substrate cover 180. The substrate cover 180 is a component manufactured separately from the upper case 110, and the detailed shape thereof will be described later with reference to FIGS.

  In the slots 121 to 128, the slot 121 on the side near the rail 138a on the right side of the battery pack 100 is an insertion port for a charging positive terminal (C + terminal), and the slot 122 is an insertion port for a discharging positive terminal (+ terminal). . Further, the slot 127 on the side close to the left rail 138b of the battery pack 100 serves as an insertion port for the negative electrode terminal (-terminal). In the battery pack 100, normally, the positive electrode side and the negative electrode side of the power terminal for transmitting electric power are arranged so as to be sufficiently separated from each other. A terminal is provided, and a negative electrode terminal is provided at a position on the left side that is sufficiently separated. Between the positive electrode terminal and the negative electrode terminal, a plurality of signal terminals for signal transmission used for control to the battery pack 100, the power tool main bodies 1 and 30, and an external charging device (not shown) are arranged. Four terminal slots 123 to 126 are provided between the power terminal groups. The slot 123 is a spare terminal insertion port, and no terminal is provided in this embodiment. The slot 124 is an insertion port for a T terminal for outputting a signal serving as identification information of the battery pack 100 to the power tool body or the charging device. The slot 125 is an insertion port for a V terminal for receiving a control signal from an external charging device (not shown). The slot 126 is an insertion port for an LS terminal for outputting battery temperature information by a thermistor (temperature sensing element) (not shown) provided in contact with the cell. On the left side of the slot 127 serving as an insertion port for the negative electrode terminal (-terminal), an LD terminal slot 128 for outputting an abnormal stop signal from a battery protection circuit (described later) included in the battery pack 100 is further provided.

  On the rear side of the upper surface 115, a raised portion 132 formed so as to be raised is formed. The raised portion 132 has a shape in which the outer shape is raised above the upper step surface 115, and a recessed stopper portion 131 is formed in the vicinity of the center thereof. The stopper 131 serves as an abutting surface for the protrusion 14 (see FIG. 2) when the battery pack 100 is attached to the battery pack attachment 10, and the protrusion 14 on the power tool main body 1 side is the stopper. When inserted until it comes into contact with 131, a plurality of terminals (device side terminals) arranged on the electric power tool body 1 and a plurality of connection terminals (described later in FIG. 4) arranged on the battery pack 100 come into contact with each other. And become conductive. In addition, the latching portion 142a of the latch 141 of the battery pack 100 (the latching portion on the right side, which cannot be seen in FIG. 3) and 142b jump out in the left-right direction under the rails 138a and 138b by the action of the spring, and the electric tool body The battery pack 100 is prevented from falling off by engaging with recesses (not shown) formed in the 30 rail grooves 11a and 11b. Inside the stopper portion 131, a slit 134 serving as a cooling air intake port connected to the inside of the battery pack 100 is provided. Further, in a state where the battery pack 100 is mounted on the electric power tool body 1, the slit 134 is covered and closed so that it cannot be visually recognized from the outside. The slit 134 is a wind window used to forcibly flow cooling air into the battery pack 100 when the battery pack 100 is connected to a charging device (not shown) to perform charging. The cooling air taken in is discharged to the outside through a slit 104 serving as an exhaust wind window provided on the front wall of the lower case 101.

  4 is an exploded perspective view of the battery pack 100 of FIG. The casing of the battery pack 100 is formed by an upper case 110 and a lower case 101 that are separable in the vertical direction. Ten battery cells are accommodated in the internal space of the lower case 101. Two screw holes 103a and 103b are formed on the front side wall surface of the lower case 101 for screwing to the upper case 110, and screws (not shown) are passed through the screw holes 103a and 103b from the bottom upward. Passed. Two screw holes 103c (not visible in the figure) and 103d are also formed in the rear side wall surface of the lower case 101. A plurality of battery cells (not shown) are fixed by a separator 445 made of a nonconductor such as a synthetic resin in a state where five battery cells are stacked in two stages. The separator 445 holds the plurality of battery cells so that only the left and right sides that are both ends of the battery cell are opened.

  A circuit board 150 is fixed on the upper side of the separator 445. The circuit board 150 fixes a plurality of connection terminals (161, 162, 164 to 168, 171, 172, 177) by soldering and electrically connects these connection terminals to a circuit pattern (not shown). The circuit board 150 is further mounted with various electronic elements (not shown here) such as a battery protection IC, a microcomputer, a PTC thermistor, a resistor, a capacitor, a fuse, and a light emitting diode. The material of the circuit board 150 is called a printed board in which a pattern wiring is printed by a conductor such as copper foil on a board impregnated with an insulating resin. A substrate can be used. In the present embodiment, a wiring pattern is formed on the upper surface (the upper surface that is the upper surface that can be seen from FIG. 4) and the lower surface (the rear surface) of the circuit board 150 using a double-sided substrate. A slot group arrangement region 160 is provided slightly in front of the front-rear direction center of the circuit board 150, and a plurality of connection terminals (161, 162, 164 to 168, 171, 172, 177) are arranged in the horizontal direction. Fixed.

  The positive terminal (161, 162, 171, 172) and the negative terminal (167, 177) are arranged at positions far apart in the left-right direction, and there are three signal terminals (T terminal 164, V terminal 165, LS terminal 166) is provided. In this embodiment, as power terminal parts, two horizontally extending arm parts, one set on the left and right on the upper side and one set on the left and right on the lower side, are used. Will be described later. As for the signal terminals (164 to 166, 168), it is also possible to use one signal terminal component as it is in the vertical direction for the arm portion as conventionally used. However, in this embodiment, in order to make the fitting state of the positive terminal (161, 162, 171, 172) and the device side terminal in the negative terminal (167, 177) equal to two, the signal terminal side has two upper and lower sides. A signal terminal component (described later in FIG. 11) having an arm portion is used.

  An LD terminal 168 is provided on the left side of the negative electrode terminal pair (167, 177). The LD terminal 168 is also formed to have two sets of upper and lower arms. All the signal terminals (164 to 166, 168) are fixed by soldering on the back surface side through the respective leg portions from the front surface to the back surface through the plurality of mounting holes 151 in which the circuit board 150 is formed. This embodiment also has a feature in the fixing method of the three signal terminals (164 to 166), details of which will be described later with reference to FIGS. As described above, after an electronic element (not shown) is mounted on the circuit board 150 and a plurality of connection terminals are fixed by soldering, the board cover 180 described later with reference to FIG. Is fixed to the separator 445 by screws (not shown). In FIG. 4, the substrate cover 180 is not shown.

  The lower case 101 has a substantially rectangular parallelepiped shape with an open top surface, and includes a bottom surface, a front wall 101a, a rear wall 101b, a right side wall 101c, and a left side wall 101d extending in a direction perpendicular to the bottom surface. The inner space of the lower case 101 has a shape suitable for accommodating the separator 445, and a number of fixing ribs 102 formed inside the bottom surface for stably holding the separator 445 and a vertical for reinforcing the wall surface. A large number of ribs 105 formed so as to be continuous in the direction are formed. A slit 104 is provided substantially at the center of the front wall 101a. The slit 134 of the upper case 110 is used as an inlet for allowing cooling air sent from the charging device side to flow into the internal space of the battery pack 100 when charging with the charging device. Is used as an outlet for cooling air.

  The output from the battery cell side is connected to the circuit board 150 through connection pull-out tabs 461a, 466a, 471a, 476a extending in a plate shape upward. Ends 494b and 496b to 499b of the lead wires from the intermediate connection point of the battery cells connected in series are arranged so as to extend upward, and are soldered onto the circuit board. Further, the intermediate pull-out tabs 462 a and 463 a from the intermediate connection point of the battery cells connected in series are arranged to extend upward so as to be connected to the circuit board 150. On the upper side of the separator 445, screw bosses 447a and 447b for fixing the circuit board 150 are formed.

  Next, a battery cell stack state using the separator 445 and a wiring method will be described with reference to a developed perspective view of FIG. The separator 445 is obtained by stacking ten battery cells 146a to 146e and 147a to 147e in two stages, upper and lower. FIG. 5 shows a state in which the battery cells 146a to 146e and 147a to 147e are pulled out from the separator 445. During assembly, the battery cells 146a to 146e are inserted into the cylindrical space 446 of the separator 445 and exposed between the left and right terminals of the separator. In addition, the connection plates 462 to 465 and 472 to 475 are connected to each other, and the drawer plates 461, 466, 471, and 476 are connected to the battery cells. After that, insulating sheets 482a and 482b are attached on the connection plates 462 to 465 and 472 to 475 and the drawer plates 461, 466, 471 and 476 for insulation.

  The axis of each battery cell is stacked so as to be parallel to each other, and the adjacent cells are disposed so that the directions of the adjacent cells are alternately reversed, and the positive and negative terminals of the adjacent battery cells are connected to the metal connecting plate 462. 465, 472-475. Both side terminals of the battery cell and the connection plates 462 to 465 and 472 to 475 are fixed by spot welding at a plurality of locations. Here, five series-connected battery cells installed in the upper stage form an upper cell unit 146 (described later in FIG. 8), and five series-connected battery cells installed in the lower side are on the lower side. A cell unit 147 (described later in FIG. 8) is formed. Here, the upper side and the lower side of the cell unit do not indicate the physical position of whether the battery cell is in the upper stage or the lower stage in the lower case 101, but two cell units are connected in series. The cell unit located on the ground side is called the “lower cell unit”, and the cell unit located on the high voltage side when connected in series is called the “upper cell unit”. Based on electrical potential. In the battery pack of this embodiment, the upper cell unit 146 is arranged in the upper stage and the lower cell unit 147 is arranged in the lower stage. However, the arrangement is not limited to this arrangement, and the battery cell arrangement method is not divided into the upper stage and the lower stage. It may be divided into a front side and a rear side.

As the battery cells 146a to 146e and 147a to 147e, lithium ion battery cells (not shown) having a diameter of 18 mm and a length of 65 mm, which are called 18650 size, can be charged and discharged multiple times. In this embodiment, in order to be able to switch the output voltage from the battery pack 100, it is possible to select the form of a series connection voltage (high voltage side output) and a parallel connection voltage (low voltage side output) of a plurality of cell units. Is done. Therefore, according to the idea of the present invention, the number of cell units is arbitrary as long as the number of cells connected in series in each cell unit is equal. The battery cell to be used is not limited to the 18650 size, but may be a so-called 21700 size battery cell or other size battery cells. The shape of the battery cell is not limited to a cylindrical shape, and may be a rectangular parallelepiped shape, a laminate shape, or other shapes. The type of battery cell is not limited to a lithium ion battery, and any type of secondary battery such as a nickel metal hydride battery cell, a lithium ion polymer battery cell, or a nickel cadmium battery cell may be used. Two electrodes are provided at both ends in the length direction of the battery cell. Of the two electrodes, one is a positive electrode and the other is a negative electrode, but the position where the electrode is provided is not limited to both ends, and any electrode can be used as long as a cell unit can be easily formed in the battery pack. Arrangement is good.

  The positive electrode of the upper cell unit 146 is connected to the circuit board 150 using a drawer plate 461 on which a drawer tab 461a is formed, and the negative electrode of the upper cell unit 146 is connected to the circuit using a drawer plate 466 on which a drawer tab 466a is formed. Connected to the substrate 150. Similarly, the positive electrode of the lower cell unit 147 is connected to the circuit board 150 using a drawer plate 471 on which a drawer tab 471a is formed, and the negative electrode of the lower cell unit 147 is a drawer plate on which a drawer tab 476a is formed. 476 is used to connect to the circuit board 150. On the upper surface of the separator 445, tab holders 450 to 452 and 455 to 457 for holding tabs of the drawer plates 461, 466, 471, and 476 formed by bending a thin metal plate are formed. The tab holders 450 to 452 and 455 to 457 are tab holding portions formed to hold the drawer tabs 461a, 462a, 463a, 466a, 471a, and 476a bent in an L shape, and are seated when the separator 445 is formed. It is integrally formed as a recess having a surface, a back surface, and both side surfaces, and drawer tabs 461a, 462a, 463a, 466a, 471a, 476a are fitted into the recesses, respectively. Two screw bosses 447 a and 447 b for screwing the circuit board 150 are formed on the separator 445. The right side of the drawer plates 461 and 471 and the connection plates 463, 465, 473, and 475 are covered with an insulating sheet 482a, and the left side of the drawer plates 466 and 476 and the connection plates 462, 464, 472, and 474 are covered with an insulating sheet 482b. Is called. The insulating sheet 482a is a material that does not conduct electricity, and a sealing material is applied to an inner portion thereof.

Next, the shapes of the two sets of power terminals will be described with reference to FIG. FIG. 6 is a partial view of the circuit board 150 shown in FIG. 4, and shows a positive terminal pair (upper positive terminal 162 and lower positive terminal 172) fixed to the circuit board 150 and a negative terminal pair (upper negative terminal 167). Only the lower negative terminal 177) is shown. The positive terminal for output is arranged so that the electrically independent upper positive terminal 162 and lower positive terminal 172 are aligned in the front-rear direction when viewed from the mounting position of the circuit board 150. These are a plurality of terminals (162, 172) arranged close to each other,
It functions as a switching terminal group used for voltage switching. Each of the upper positive terminal 162 and the lower positive terminal 172 has an arm set (arms 162a and 162b, arms 172a and 172b) that extends forward. Here, the arm portions 162a and 162b and the arm portions 172a and 172b are separated from each other in the vertical direction, and the positions of the fitting portions in the front-rear direction are substantially the same. These positive terminal pairs (162, 172) are arranged in a single slot 122. The negative electrode terminal pair has the same shape as the positive electrode terminal pair, and is constituted by an upper negative electrode terminal 167 and a lower negative electrode terminal 177, and these negative electrode terminal pairs (167, 177) are arranged inside a single slot 127. The These are a plurality of terminals (167, 177) arranged close to each other, and function as a switching terminal group used for voltage switching. Inside the slot 127, the arm set of the upper negative terminal 167 is arranged on the upper side, and the arm set of the lower negative terminal 177 is arranged below the arm set of the upper negative terminal 167. Although not shown in FIG. 6, a positive electrode terminal pair for charging (upper positive electrode terminal 161 and lower positive electrode terminal) is placed on the right side of the positive electrode terminal pair for discharging (upper positive electrode terminal 162 and lower positive electrode terminal 172). 171: see FIG. 4). The shape of the positive electrode terminal pair (161, 171) for charging is the same shape as the upper positive electrode terminal 162 and the lower positive electrode terminal 172.

  FIG. 7A is a perspective view showing a single component of the upper terminal component 260 and the lower terminal component 280. The upper terminal component 260 is a common component used as the upper positive terminals 161 and 162 and the upper negative terminal 167, and the lower terminal component 280 is a common component used as the lower positive terminals 171 and 172 and the lower negative terminal 177. It is. The upper terminal component 260 and the lower terminal component 280 are formed by cutting a flat plate made of a conductive metal into a U shape after being cut out by pressing. The upper terminal component 260 is bent so that the U-shaped bottom surface, that is, the bridge portion 262 is on the rear side, and the lower terminal component 280 is bent so that the bridge portion 282 is on the rear side. The upper terminal component 260 is formed with long arms 265 and 266 that extend to the upper side of the lower terminal component 280. When viewed from the front-rear direction in which the arm portions 265, 266 extend, the bridge portion 262 has an orthogonal surface, and the surface is a vertical surface extending in the vertical direction.

  The upper terminal component 260 has a right side surface 263 and a left side surface 264 that are formed in a U-shape so as to be parallel to each other, and a bridge portion 262 that connects the right side surface 263 and the left side surface 264. On the front side of the right side surface 263 and the left side surface 264, arm portions 265 and 266 that sandwich the device side terminal from the left and right sides to the inside are provided, respectively. The front side portion of the left side surface 264 is formed so as to extend in a planar shape in the vertical direction from the lower side to a position close to the upper end, and the arm portions 265 and 266 are extended from the vicinity near the upper end to the front side. The shape of the right side surface 263 is formed symmetrically with the left side surface 264. The arm portion 265 is disposed to extend from the upper front side of the right side surface 263 to the front side, and the arm portion 266 is disposed to extend from the upper front side of the left side surface 264 to the front side. As described above, the arm portions 265 and 266 are formed so as to extend from the upper portion of the front side portion of the base portion 261 to the front side, that is, in a direction parallel to the mounting direction of the battery pack 100. The arm portions 265 and 266 are pressed by pressing so that the arm portions 265 and 266 face each other when viewed in the left-right direction and come close to a position at which the minimum gap portion, that is, the fitting portion that fits with the device connection terminal almost contacts. Have sex. Here, press processing is plastic processing performed using a press machine, pressing a material such as sheet metal against the mold with high pressure, and performing shearing processing such as cutting, punching, drilling, etc. According to the bending process and drawing process, it is sheared and formed into a required shape. In the present embodiment, the upper terminal component 260 and the lower terminal component 280 are formed of, for example, a flat plate having a thickness of 0.8 mm. Thereby, the upper side positive terminals 161 and 162 and the upper side negative terminal 167 have high mechanical strength, and the fitting pressure when mating with the equipment side terminal is increased. In addition, you may make it give heat processing, a plating process, etc. after a press work.

  The lower terminal component 280 is manufactured in the same manner, and a base portion 281 including a right side surface 283, a left side surface 284, and a bridge portion 282 that connects the right side surface 283 and the left side surface 284 formed so as to be parallel to each other by U-shape. Arm portions 285 and 286 are formed on the front side from the vicinity of the elongated upper portions of the right side surface 283 and the left side surface 284. The arm portions 285 and 286 are shaped to sandwich the device-side terminal from the left and right sides toward the inside. The distance S between the upper end position of the upper arm set (265, 266) and the lower end position of the lower arm set (285, 286) is approximately equal to the width of the power terminal provided in the conventional 18V battery pack. Configure to be equivalent. On the other hand, the upper arm set (265, 266) and the lower arm set (285, 286) are arranged so as to be separated from each other by a predetermined distance S1. Under the lower arm set (285, 286), a notch 291 that is greatly cut out from the front side is formed. The rear side of the lower terminal component 280 is fixed side by side in the front-rear direction so as not to contact with the right side surface 263 and the left side surface 264 of the upper terminal component 260 with a predetermined gap therebetween.

In FIG. 7B, the leg portions 267 and 268 are hatched so that the range is clear. The base portion 261 referred to in this specification is a portion exposed upward from the surface of the circuit board 150 to be attached, and is a portion excluding the arm portions 265 and 266. The base portion 261 of the upper terminal component 260 includes a right side surface 263, a left side surface 264, and a bridge portion 262. Leg portions 267 and 268 are connected below the lower side portion of the base portion 261. The right side surface 263 and the left side surface 264 are substantially rectangular extending in the vertical direction, and are formed so that the arm portions 265 and 266 extend forward in a portion near the upper end. The width (length in the vertical direction) is large in the vicinity of the rear side roots of the arm portions 265 and 266, that is, in the vicinity of the chain line B2, the width gradually decreases toward the front, and the width is constant further in front of the virtual line B1. Become. Fitting portions 265 d, the 266d, are bent inward when viewed from the top in a curved shape having a predetermined radius of curvature _{R 1.} Thus, the arm portions 265 and 266 are formed so as to extend forward from the upper front side portion of the U-shaped base portion, and the arm portions 265 and 266 are formed so as to have a spring property in a non-contact state. The

  The leg portions 267 and 268 are inserted into the mounting holes (through holes) of the circuit board 150 so that the leg portions 267 and 268 protrude from the mounting surface (front surface) of the circuit board 150 to the surface opposite to the mounting surface (back surface). The legs 267 and 268 are soldered to the circuit board 150 on the back surface. Also, the arm portions 265 and 266 are electrically connected to the battery cells and electronic elements mounted on the circuit board 150 by soldering. Here, the height H1 of the leg portions 267 and 268 is formed to be larger than the thickness of the circuit board 150 and smaller than twice. As shown by the arrow 262a, the bridge portion 262 protrudes so as to bend toward the rear side at the lower portion of the rear side of the right side surface 263 and the left side surface 264. Used for positioning in the vertical direction when the terminal component 280 is attached to the circuit board 150. On the front side of the lower side portion of the right side surface 263 and the left side surface 264, a bent portion 263a is formed by forming a portion extending in a convex shape in the horizontal direction and bending the convex portion inward (not shown). 264a is formed. A substantially circular cutout portion is formed on the upper and lower sides of the bent portions of the bent portions 263a and 264a in order to facilitate the bending process. The bent portions 263a, 264a and the stepped portion 262a are formed to position the upper terminal component 260 in the vertical direction so as to be in contact with the upper surface of the circuit board 150 near the mounting hole.

The base portion 261 has a substantially L shape that is inverted in a side view. The rear portions of the arm portions 265 and 266 are formed with flat portions 265a and 266a in which the right side surface 263 and the left side surface 264 extend in the same plane from the vicinity of the connection portion on the rear side toward the front. The tip portion of the arm portion 265 and 266 fitting portion 265d which is bent so as to spread outward at large radii of curvature _{R 1,} 266d are formed. When the curved surface portions inside the fitting portions 265d and 266d are in contact with the terminals of the power tool main bodies 1 and 30, the upper terminal component 260 is electrically connected to the connection terminals on the power tool main bodies 1 and 30 side. Become. The insides of the fitting portions 265d and 266d are shaped so as to have a slight gap when the battery pack 100 is detached from the power tool main bodies 1 and 30. The front side of the fitting portions 265d and 266d is formed so that the distance increases rapidly as it goes forward, and guides the terminals on the power tool main body 1 and 30 side.

  The lower terminal component 280 has a right side surface 283 and a left side surface 284 formed so as to be bent in parallel with a U-shape and a bridge portion 282 that connects them. The arm portions 285 and 286 are provided to extend forward and obliquely upward. The vertical widths of the arms 285 and 286 are substantially constant in the front-rear direction, and are formed to extend in the horizontal direction on the front side of the virtual line B1, but are arranged obliquely on the rear side of the virtual line B1. . A cutout portion 291 that is largely cut out from the front side is formed below the arm set (285, 286) of the lower terminal component 280. As a result of the formation, the lengths of the arm portions 265 and 266 of the upper terminal component 260 (length in the front-rear direction and forward of B2) are the lengths of the arm portions 285 and 286 of the lower terminal component 280 ( The length in the front-rear direction is longer than the position on the arrow 291 side. Even in such an arm set having different lengths in the front-rear direction, the fitting pressure at the fitting portion of the upper terminal component 260 is preferably the same as the fitting pressure of the lower terminal component 280. If the fitting pressure is not equalized, the contact resistance with the flat tool-side terminal on the power tool main body 1 or 30 side may change, causing a slight difference in heat generation, or the wear situation due to long-term use may be different. Because there is. In this modification, in order to balance the fitting pressure between the upper terminal component 260 and the lower terminal component 280, the initial gap interval in the non-attached state of the battery pack is made different. That is, in a state where the battery pack 100 is not attached to the power tool body 1 or 30 (detached state), the minimum interval between the left and right arm portions 265 and 266 is different from the interval between the arm portions 285 and 286. Here, the interval between the arm portions 265 and 266 of the upper terminal component 260 is 0.2 mm, whereas the minimum interval between the arm portions 285 and 286 of the lower terminal component 280 is 0.5 mm.

  In order to make the fitting pressure uniform, the shape of the upper terminal component 260 and the lower terminal component 280 was also devised. That is, as shown in FIG. 7 (2), the upper terminal component 260 should originally form a substantially right angle interior such as the dotted line 264b. Here, the outline of the dotted line 264b extends in the direction of the arrow 264e, The shape is such that an isosceles triangular reinforcing surface 264c is added in view. As a result, the outline of the inner corner portion is slanted as indicated by an arrow 264d, and the attachment rigidity of the arm portions 265 and 266 of the upper terminal parts is improved by this shape change. In accordance with the change in the shape of the inner corner portion of the upper terminal component 260, the outer corner portion of the lower terminal component 280 is cut off from the dotted line 284b in the direction of the arrow 284e, whereby an isosceles triangular cut-out portion 284c is seen in side view. The shape is such that As a result, the outline of the outer corner portion is as shown by an arrow 284d, and the rigidity of the arm portions 285 and 286 of the lower terminal component is reduced. Contour portions indicated by the arrows 264d and 284d are determined so as to be spaced apart from each other so as to be substantially parallel to each other in a side view. If the cut-off portion 284c is formed, the length of the bridge portion 282 in the vertical direction is shortened. However, since the lower terminal component 280 is small, it is sufficiently stronger than the upper terminal component 260 in strength, so that a balance of strength can be obtained by changing these shapes. In this way, the shape of the inner corner portion where the reinforcing surface 264c is added to the upper terminal component 260 is changed, and the shape of the outer corner portion where the strength is adjusted by forming the cut-off portion 284c is changed to the lower terminal component 280. As a result, the balance between the strengths of the two members was obtained, and the fitting pressures to the main body side terminals by the arm portions 265, 266, 285, and 286 could be made substantially equal.

  FIG. 7C is a view of the upper terminal component 260 and the lower terminal component 280 as viewed from the front. When the battery pack 100 is not attached, the minimum distance between the upper and lower arm sets is made different. That is, it is configured such that the space between the lower arm portions 285 and 286 in the left-right direction is larger than the space between the upper arm portions 265 and 266 in the left-right direction. This is such that the arm portions 265 and 266 and the arm portions 285 and 286 arranged side by side are inversely proportional to the length in the mounting direction (front-rear direction). The long arm portions 265 and 266 face each other at a narrow interval in the initial state. On the contrary, the short arm portions 285 and 286 face each other with a wide interval.

  As described above, the power terminal uses the upper terminal component 260 and the lower terminal component 280 having a thick plate thickness of 0.8 mm. Since only a minute current flows with respect to the signal terminal component, it may be manufactured with a metal plate having a thickness of about 0.3 mm as in the conventional battery pack 15. In this modification, the rigidity of the power terminal through which a large current flows was further improved, and the fitting state could be maintained well over a long period of use as well as during work. In addition, in order to make the fitting pressures of the upper and lower arms substantially the same, it is not limited only to the adjustment of the gap of the fitting part and the change of the shape near the mounting source, but other changes, particularly the thickness of the plate This can also be achieved by adjustment, selection of the material of the terminal component, and the like.

  Next, the shape of the terminal part 20 on the power tool main body 1, 30 side and the connection state of the connection terminal of the battery pack 100 when the battery pack 100 is mounted on the power tool main body 1, 30 will be described using FIG. 8. To do. FIG. 8A is a diagram illustrating a state in which the battery pack 100 is mounted on the 36V electric power tool body 30. As described above, ten battery cells are accommodated in the battery pack 100, of which five constitute the upper cell unit 146 and the remaining five constitute the lower cell unit 147. The power tool main body 30 operates the drive unit 35 by fitting with the upper positive terminal 162 and the upper negative terminal 167. At this time, since the short bar provided in the electric power tool body 30 forms an electrical connection circuit indicated by a dotted line 59, the upper cell unit 146 and the lower cell unit 147 are connected in series. That is, the negative electrode of the upper cell unit 146 is connected to the positive electrode of the lower cell unit 147, the positive electrode of the upper cell unit 146 is connected as the positive output of the battery pack 100, and the negative electrode of the lower cell unit 147 is connected as the negative output. The In this way, a series output of the upper cell unit 146 and the lower cell unit 147, that is, a rated voltage of 36V is output.

  FIG. 8B is a diagram illustrating a state in which the battery pack 100 is mounted on the 18V electric power tool body 1. The 18V electric power tool main body 1 is provided with a positive electrode input terminal (described later in FIG. 10) having a size to be fitted simultaneously with the upper positive terminal 162 and the lower positive terminal 172. Similarly, a negative electrode input terminal (described later in FIG. 10) having a size to be fitted simultaneously with the upper negative terminal 167 and the lower negative terminal 177 is provided. That is, a positive output is obtained when the positive electrodes of the upper cell unit 146 and the lower cell unit 147 are connected, and a negative output is obtained when the upper cell unit 146 is connected to the negative electrodes of the lower cell unit 147. It becomes a parallel connection state. As a result, when the power tool body 1 is connected, a rating of 18V is automatically output. Thus, it becomes possible to switch the output voltage obtained from the battery pack 100 by changing the connection relationship with the switching terminal group (162, 167, 172, 174) for switching the voltage of the battery pack 100. .

  9A is a perspective view of the terminal portion 50 of the electric power tool main body 30 of the present embodiment, FIG. 9B is a perspective view of the short bar 59 alone, and FIG. 9B is a perspective view of the terminal portion 50 and the battery pack 100. It is a figure which shows the connection method with other electric power terminals. In the terminal portion of the power tool main body 30 having a rating of 36 V, a terminal portion 52a of the positive electrode input terminal 52 for receiving power and a terminal portion 57a of the negative electrode input terminal 57 are formed small and provided on the upper side as input terminals for power. . At the time of mounting, the terminal portion 52 a of the positive input terminal 52 is fitted only to the upper positive terminal 162, and the terminal portion 57 a of the negative input terminal 57 is fitted only to the upper negative terminal 167. On the other hand, a short bar 59 (59a, 59b) for short-circuiting the lower positive terminal 172 and the lower negative terminal 177 is provided at the terminal portion of the electric power tool body 30. As shown in FIG. 9 (2), the short bar 59 is a short-circuit formed of a metal conductive member, and is a member bent into a U-shape. A terminal portion 59b is formed on one end side of the connection portion 59a of the short bar 59, and is disposed below the terminal portion 52a. A terminal part 59c is formed on the other end side of the connection part 59a of the short bar 59, and the terminal part 59c is disposed below the terminal part 57a. The terminal portion 59b is fitted with the lower positive terminal 172, and the terminal portion 59c is fitted with the lower negative terminal 177. The short bar 59 is fixed so as to be cast into a synthetic resin base 51 (described later in FIG. 7) together with other device side terminals such as the positive electrode input terminal 52 and the negative electrode input terminal 57. At this time, the short bar 59 is not in contact with the other metal terminals (52, 54 to 58). Further, since the short bar 59 is used only for short-circuiting the lower positive terminal 172 and the lower negative terminal 177, it is not necessary to perform wiring to the control circuit of the power tool body.

  The positive electrode input terminal 52 is a portion that fits with the upper negative electrode terminal 167 and solders a lead wire that connects the terminal portion 52a formed in a flat plate shape with the circuit board side on the power tool body 30 side. The wiring part 52c is connected to the terminal part 52a and the wiring part 52c and is connected to a base 51 made of synthetic resin (not shown). The negative input terminal 57 is also the same as the positive input terminal 52, and the height of the terminal portion 57a is about half or smaller than the other terminal portions (54a to 56a, 58a). The other terminal portions (54a to 56a, 58a) are terminals for signal transmission, and are connected to the control circuit board on the power tool main body 30 side by lead wires (not shown) through the wiring portions 54c to 56c, 58c. Is done. On the front side and the rear side of the base 51 made of synthetic resin of the terminal portion 50, concave portions 51b and 51c for being sandwiched by the housing are provided.

  9 (3), when the battery pack 100 is mounted, if the battery pack 100 is moved relative to the power tool body 30 along the insertion direction, the positive input terminal 52 and the terminal portion 59b are in the same slot. 122 (see FIG. 3) and inserted into the inside, and fitted into the upper positive terminal 162 and the lower positive terminal 172, respectively. At this time, the positive input terminal 52 is press-fitted between the arms 162a and 162b of the upper positive terminal 162 so as to spread between the fitting portions of the upper positive terminal 162, and the terminal portion 59b of the short bar 59 is connected to the lower positive electrode. The terminal 172 is press-fitted so as to spread between the arms 172a and 172b. Similarly, the negative input terminal 57 and the terminal portion 59c are inserted into the inside through the same slot 127 (see FIG. 3), and are fitted to the upper negative terminal 167 and the lower negative terminal 177, respectively. At this time, the terminal portion 57a of the negative electrode input terminal 57 is press-fitted between the arm portions 167a and 167b of the upper negative electrode terminal 167 so as to push the gap between the fitting portions. Further, the terminal portion 59c of the short bar 59 is press-fitted so as to push the space between the arm portions 177a and 177b of the lower negative electrode terminal 177.

  Since the plate thickness of the terminal portions 52a, 57a, 59b, 59c is slightly larger than the initial gap (gap when the battery pack 100 is not attached) of the fitting portions of the respective arm portions, the terminal portions 52a, 57a, A predetermined fitting pressure acts on a fitting point between each of 59b and 59c and the upper positive terminal 162, the lower positive terminal 172, the upper negative terminal 167, and the lower negative terminal 177. As a result of such connection, the device side terminals (terminal portions 52a, 57a, 59b, 59c) of the electric power tool body 30 and the battery pack power terminals (upper positive terminal 162, lower positive terminal 172, upper negative terminal 167, The lower negative terminal 177) makes good contact in a state where the electrical contact resistance is reduced. In this way, the power tool main body 30 is a third terminal that is inserted into a single slot (122 and connected only to the first terminal (162) of the first and second terminals (162, 172). (52a) and a fourth terminal (59b) inserted into the single slot (122) and connected only to the second terminal (172), and the battery pack 100 is attached to the electric tool body 30. When connected, in the single slot 121, the first and third terminals (162 and 52a) are connected to each other to become the first potential, and the second and fourth terminals (172 and 59b) are connected to each other. Since they are connected to each other and have a second potential different from the first potential, the negative terminal pair (167, 177) is also connected in the same manner, so that the connection form shown in FIG. Cell unit 146 and lower cell unit 14 The output of the series connection, that is, the nominal 36V is outputted from the battery pack 100.

  On the other hand, when the battery pack 100 is attached to the conventional 18V electric power tool body 1, the connection relationship is as shown in FIG. When the battery pack 100 is attached to the electric tool main body 1, the terminal portion 22 a of the positive electrode input terminal 22 is fitted and press-fitted so as to spread both the upper positive terminal 162 and the open end of the lower positive terminal 172. The upper partial area of the terminal portion 22 a of the positive input terminal 22 is in contact with the upper positive terminal 162, and the lower partial area is in contact with the lower positive terminal 172. Thus, by fitting the terminal portion 22a to the arm portions 162a, 162b of the upper positive terminal 162 and the arms 172a, 172b of the lower positive terminal 172 simultaneously, the two positive terminals (162, 172) are short-circuited. Become. Similarly, the terminal portion 27a of the negative input terminal 27 is press-fitted so as to spread both the open ends of the upper negative terminal 167 and the lower negative terminal 177, and the upper side of the terminal portion 27a of the negative input terminal 27 is inserted. A part of the region is in contact with the upper negative terminal 167 and a part of the lower part is in contact with the lower negative terminal 177. By thus fitting the terminal portion 27a simultaneously with the arm portions 167a and 167b of the upper negative terminal 167 and the arm portions 177a and 177b of the lower negative terminal 177, the two negative terminals (167 and 177) are short-circuited. The power tool body 1 outputs a parallel connection of the upper cell unit 146 and the lower cell unit 147, that is, a rating of 18V. The terminal portion 22a of the positive electrode input terminal 22 and the terminal portion 27a of the negative electrode input terminal 27 are made of a metal plate having a certain thickness. Therefore, it is important that the fitting pressure by the arms of the upper positive terminal 162 and the upper negative terminal 167 is equal to the fitting pressure by the arms of the lower positive terminal 172 and the lower negative terminal 177.

  As described above, the battery pack 100 according to this embodiment is mounted on either the 18V power tool body 1 or the 36V power tool body 30 so that the output of the battery pack 100 is automatically switched. An easy-to-use battery pack 100 corresponding to the voltage could be realized. This voltage switching is not performed on the battery pack 100 side, but is automatically performed depending on the shape of the terminal portion on the power tool main body 1, 30 side, so there is no possibility that a voltage setting error will occur. Further, since it is not necessary to provide a dedicated voltage switching mechanism such as a mechanical switch on the battery pack 100 side, the structure is simple, the risk of failure is low, and a long-life battery pack can be realized. Since the short bar 59 for short-circuiting the lower positive terminal 172 and the lower negative terminal 177 can be mounted in the same space as the existing terminal portion 20 of the 18V battery pack, the voltage is switched in a size compatible with the conventional one. A battery pack of the type can be realized. Furthermore, when charging using an external charging device, it is possible to charge with the connection method as shown in FIG. 10 (2), so that the charging device performs both high voltage / low voltage charging. There is no need to prepare.

  When the battery pack 100 is charged using an external charging device (not shown), it can be charged with the same charging device as a conventional 18V battery pack. The terminal of the charging device in that case has the same shape as in FIG. 10A, but instead of the discharging positive terminal (162, 172), the charging positive terminal (upper positive terminal 161, lower positive terminal) 171) is connected to the positive terminal of the charging device (not shown). The connection status at that time is also almost the same as the connection relationship shown in FIG. Thus, since charging is performed using the 18 V charging device in a state where the upper cell unit 146 and the lower cell unit 147 are connected in parallel, a new charging device is used when charging the battery pack 100 of the present embodiment. There is an advantage that it is not necessary to prepare.

  Next, the shape of the parts used for the three terminals (164 to 166), that is, the signal terminal parts 240 will be described with reference to FIG. The signal terminal component 240 is manufactured by pressing a single metal plate, and the metal thin plate is bent so that the bridge portion 242 serving as a U-shaped bottom portion becomes a rear vertical surface. From the base portion 241, an arm set (arm bases 245 and 246) extends forward, and the arm base 245 is formed to be separated into upper and lower arm sets (arms 251 and 253), The arm base 246 is formed so as to be separated into upper and lower arm sets (252, 254) in the notch groove 246b extending in the horizontal direction. The metal plate used for the press working is a flat plate having a thickness of 0.3 mm, and may be thinner than the plate thickness of 0.5 mm of the upper terminal component 260 and the lower terminal component 280 used for the power terminal. The upper and lower arm sets are formed in the same shape and have the same length in the front-rear direction, width in the vertical direction, plate thickness, and the like. The upper arm set (arms 251 and 252) and the lower arm set (arms 253 and 254) are formed with fitting parts (251d, 253d, etc.), respectively. Therefore, the curved shape is the same in the upper and lower sides, and the left and right arm portions are in a plane-symmetric shape. On the other hand, the mounting positions of the leg portions 249 and 250 are arranged so as to be largely shifted in the front-rear direction. The shape of the lower side portion of the base portion 241 is different between right and left, and the shapes of the right side surface 243 and the left side surface 244 are asymmetric. The leg portion 249 is arranged to be largely shifted to the front side with respect to the position of the conventional leg portion 250, and the leg portions 249 and 250 are separated from each other in the front-rear direction. In this way, the leg 249 and the leg 250 are not arranged adjacent to each other in the left-right direction, but are arranged so as to be shifted back and forth, so that an extended portion 243a greatly extended forward is provided near the lower side of the right side surface 243. The leg portion 249 is formed so as to extend downward from the front end portion thereof. The leg portion 249 and the leg portion 250 each penetrate a through hole (not shown) formed in the circuit board 150 from the front surface to the back surface side, and a portion protruding to the back surface side is soldered, whereby the circuit substrate 150 The upper arm set (arms 251 and 252) and the lower arm set (arms 253 and 254) are electrically connected to the electronic elements mounted on the circuit board 150. .

  Above the leg portion 249, a bent portion 243b bent in the left direction is formed to limit the amount of insertion into the mounting hole 151 (see FIG. 4) of the circuit board 150. Cutout portions 243c and 249a cut out in a semicircular shape are formed on the upper and lower sides of the bent portion of the bent portion 243b in order to facilitate the bending process. For positioning the rear leg portion 250 on the circuit board 150, step portions 250a and 250b formed on the front side and the rear side of the leg portion 250 are used. The stepped portion 250a is formed by extending the lower side portion of the left side surface 244 forward, and the stepped portion 250b is formed using the lower side portion of the bridge portion 242 that curves in a U shape. As described above, when the step portions 250 a and 250 b abut on the surface of the circuit board 150, the mounting position of the leg portion 250 in the vertical direction can be determined. The mounting positions of the leg portions 249 and 250 in the front-rear direction are defined by the positions of the mounting holes 151 (see FIG. 4) of the circuit board 150.

  FIG. 11B is a diagram of the signal terminal component 240 alone as viewed from the front lower side. As can be seen from this figure, a notch groove 245b extending in the horizontal direction is formed on the front side of the arm base 245 so as to be separated into upper and lower arm sets (arm portions 251 and 253). Further, the right leg 249 is arranged so as to be largely displaced forward compared to the left leg 250. As a result, the signal terminal component 240 can be firmly held on the circuit board even when an upward or downward force is applied to the four arm portions 251, 252, 253, 254. The external force applied to the arm portions 251, 252, 253, and 254 is applied so as to push the arm portion set backward when the battery pack 100 is attached to the power tool main bodies 1, 30, and this force causes the signal terminal component 240 to be pushed. The direction is to tilt backwards. On the contrary, when removing the battery pack 100 from the electric power tool main bodies 1 and 30, it becomes a force that pushes the arm set to the front side, and this force is in a direction to tilt the signal terminal component 240 forward. Thus, the external force applied when the battery pack 100 is mounted and removed can be effectively received by shifting the positions of the legs 249 and 250 in the front-rear direction, and the mounting rigidity of the signal terminal component 240 is greatly enhanced. As a result, the durability of the battery pack 100 could be improved. Furthermore, since the arm set is also divided into two stages, upper and lower, even if it receives various vibrations or external forces during the operation of the power tool, it is electrically driven by the four contact areas of the arm. Good contact with the tool body side terminal can be maintained. Here, the “contact area” refers to the arm portions 251, 252, 253, and 254 of the signal terminal component 240 and the input terminals (for example, the positive input terminal 52 and the negative input terminal) when the battery pack 100 is mounted on the power tool body. 57). On the other hand, since the number of mounting holes and the number of soldering portions of the circuit board 150 necessary for manufacturing the signal terminal component 240 are the same as the conventional one, an increase in manufacturing cost can be suppressed.

  The signal terminal component 240 of the present embodiment has not only improved rigidity but also other effects. Conventional signal terminal parts (not shown) are provided with two leg portions that are soldered to a circuit board to be electrically and mechanically attached, but the leg portions are juxtaposed in the left-right direction. In many cases, the soldering part is connected to the narrow part between the parts, and wiring for passing the signal pattern between the left and right leg parts is not possible. In the battery pack 100 of the present embodiment, one leg 249 of the signal terminal component 240 is arranged on the front side, and the other leg 250 is arranged on the rear side, and both legs are separated. Accordingly, the distance between the leg portions of the signal terminal component 240 is increased, and it is easy to wire a plurality of wirings or a thick pattern through which a main current flows. Such a signal terminal component 240 is suitable when it is desired to increase the functionality of the battery pack 100 of the present embodiment, that is, the conventional battery pack, and to promote downsizing in terms of voltage ratio. In particular, when the voltage switching function is realized while increasing the voltage, the number of electronic elements mounted on the circuit board 150 increases. Therefore, it is necessary to increase the efficiency of the pattern wiring and increase the thickness of the wiring through which the main current flows. In this embodiment, the circuit board 150 is larger than that conventionally used, and the electronic elements are mounted not only on the rear side of the connection terminal group but also on the front side region. At that time, the wiring pattern is also arranged below the signal terminal component 240. The arrangement will be described with reference to FIG.

  FIG. 12 is a diagram showing a state of fixing a plurality of signal terminal components 240 to the circuit board 150. (1) is a diagram seen from the front, and (2) is a diagram seen from the left. is there. The signal terminal component 240 is a common component, and is fixed side by side in the left-right direction on the circuit board 150 as a T terminal 164, a V terminal 165, and an LS terminal 166. Since the signal terminal component 240 is formed with a notch portion in the vicinity of the center of the arm portion so as to generate the interval S2, the upper arm portion set (251, 252) and the lower arm portion set (253, 254) are vertically moved. In such a shape, there are two stages. In the state where the device side terminal is not attached, the closest part (fitting part) of the upper arm set (251, 252) and the lower arm set (253, 254) has a slight gap. It is arranged to be separated or abutted. The leg portions 249 and 250 pass through the mounting holes (see FIG. 4) of the circuit board 150 and protrude downward, and are fixed by solder 256 on the lower side (back surface) of the circuit board 150.

  In the side view of FIG. 12 (2), the leg 249 located at the front and the leg 250 located at the rear are separated by a distance S3. The distance S3 is preferably made larger than the distance between the leg portions 249 and 250 (distance in the left-right direction). By forming a gap as indicated by the arrow 257 in this way, it becomes easy to wire a circuit pattern in the gap. FIG. 12 (3) is a bottom view of the circuit board 150 of FIG. 12 (1) as viewed from below. On the back surface of the circuit board 150, a through hole is formed in the center for soldering the signal terminal component 240, and lands 153 a to 155 a, 153 b to 153 in which a substantially square copper foil for soldering is arranged around the through hole. 155b is formed. The wiring pattern for connection from the lands 153a to 155a and 153b to 155b to the upper cell unit 146 or the lower cell unit 147 is on the surface side of the circuit board 150 and is not visible in the drawing of (3). The left leg lands 153a to 155a and the right leg lands 153b to 155b are arranged so as to be displaced forward and backward. As a result, a plurality of wiring patterns 157 to 159 can be arranged between the lands 153a to 155a and the lands 153b to 155b as shown in the figure. Here, the wiring patterns 157 to 159 are illustrated as being provided three by three, but may be one thick wiring or a combination of other numbers. Since the wiring pattern is arranged between the leg portions 249 and 250 arranged so as to be shifted in the front-rear direction in this way, the signal terminals are maintained while maintaining the same distance between the adjacent signal terminals 164 and 165 and 165 and 166 as before. A plurality of wiring patterns 157 to 159 that connect the rear side and the front side of 164 to 166 can be provided. As another method for increasing the number of wiring patterns connecting the rear side and the front side of the signal terminals 164 to 166, a method of providing a cutout portion 243c as shown by a dotted line in FIG. A cutout portion 243 c that is notched upward as indicated by a dotted line is formed in the vicinity of the lower side of the right side surface 243 and in contact with the circuit board 150. Then, a portion indicated by an arrow 257 becomes a gap that separates the circuit board 150 from the distance. A circuit pattern can be arranged between the gap and the circuit board 150 in the same manner as the wiring patterns 157 to 159 in FIG. In this way, a plurality of wiring patterns that connect the rear side and the front side of the signal terminals 164 to 166 can be arranged not only on the back side 150b of the circuit board but also on the front side 150a. It becomes possible to improve.

  FIG. 13 is a side view of the separator 445 after assembling the components shown in FIG. 5, wherein (1) is a right side surface and (2) is a left side view. Here, for ease of explanation, the connection terminal group shows only two sets of the positive electrode terminal (162, 177) for discharge and the negative electrode terminal (167, 177), and the other connection terminals (161, 164˜). 166, 168, and 171) are omitted. The upper cell unit 146 includes battery cells 146a to 146e arranged on the upper stage side. The upper cell unit 146 includes an extraction tab 461a that extends upward from the extraction plate 461 on the positive electrode side, and an extraction tab 466a that extends upward from the extraction plate 466 on the negative electrode side. Connected to the circuit board 150. A slit-like through hole (not shown) is formed in the circuit board 150, and the through hole is penetrated from the lower side to the upper side so that the upper portions of the drawing tabs 461 a and 466 a are exposed from the surface of the circuit board 150 to the upper side. . By soldering that portion, the circuit board 150 and the extraction tabs 461a and 466a are electrically connected. Similarly, the lower cell unit 147 is constituted by battery cells 147a to 147e arranged on the lower stage side, and a circuit is formed by connecting drawing tabs 471a and 476a extending upward from drawing plates 471 and 476 provided at both ends. Connected to the substrate 150. A slit-like through hole (not shown) is formed in the circuit board 150, and the through hole is penetrated from the lower side to the upper side so that the upper portions of the drawing tabs 471 a and 476 a are exposed from the surface of the circuit board 150 to the upper side. . By soldering that portion, the circuit board 150 and the extraction tabs 471a and 476a are electrically connected.

  The connection plate 463 shown in FIG. 13 (1) is provided with an intermediate drawer tab 463a extending upward, and the connection plate 462 shown in FIG. 13 (2) is provided with an intermediate extraction tab 462a extending upward. The intermediate drawers 462a and 463a extend from the connecting plates 462 and 463 disposed on the upper side to the upper side, bend inward along the circuit board 150, and bend upward again to be intermediate drawer tabs 462a and 463a. It is the bending body of the thin metal plate which formed. A slit-like through hole (not shown) is formed in the circuit board 150, and the upper part of the intermediate drawer tabs 462 a and 463 a is exposed from the surface of the circuit board 150 to the upper side through the through hole. To do. The intermediate drawer tabs 462a and 463a are fixed by soldering to the circuit board 150. The width (the distance in the front-rear direction) of the intermediate drawer tabs 462a and 463a is formed smaller than the width (the length in the front-rear direction) of the drawer tab 461a in FIG. 13A and the drawer tab 466a in FIG. This is because the extraction tabs 461a, 466a, 471a, 476a are terminals for outputting electric power and a terminal through which a large current flows, whereas the intermediate extraction tabs 462a, 463a are terminals connected for measuring an intermediate potential. This is because only a small current flows. It is also possible to form intermediate drawer tabs on the other connection plate 464 and connection plate 465 provided on the upper side. However, here, due to the formation of the wiring pattern, the connection terminals 464a and 465a are provided and connected to the circuit board 150 by lead wires (not shown). Since it is difficult to connect the connection plates 472 to 475 provided on the lower side to the circuit board 150 using the pull-out tabs, connection terminals 472a to 475a are provided and connected to the circuit board 150 with lead wires 496 to 499. I made it.

  FIG. 14 is a perspective view showing a state in which the circuit board 150 is fixed to the separator 445, and shows a state seen from the upper left front. In the circuit board 150, the upper portions of the slit-shaped through holes 152 c and 152 b are exposed upward from the surface of the circuit board 150. By soldering that portion, the circuit board 150 and the extraction tabs 471a and 476a are electrically connected. As described above, the battery cells 146a to 146e of the upper cell unit 146 are directly connected and the battery cells 147a to 147e of the lower cell unit 147 are connected in series, but the connection plates 462 to 464 and the connection plates 472 to 474 are connected. Lead wires 496 to 499 for measuring the potential (however, 497 and 499 are not visible in FIG. 14) are connected. The ends 494b, 496b, 497b, 498b, and 499b of the lead wires shown in FIG. These lead wires are connected to the end portions of the lead wires opposite to the end portions 494b, 496b, 497b, 498b, and 499b after the circuit board 150 is fixed to the separator 445 with soldering on the circuit board side first. Solder to the plates 464, 465, 472-475. On the other hand, the connection plates 462 and 463 that are close to the circuit board 150 are not connected to the circuit board 150 using lead wires, but are bent into an L-shape and the vertical drawer portion extends upward. They are directly connected using 462a and 463a.

  The output tabs 461a, 466a for the output (+ output, -output) of the upper cell unit 146 are shaped so as to be substantially L-shaped in front view or rear view, and the longitudinal direction of the circuit board 150 is substantially rectangular. Arranged to be parallel to the long side. The drawer tabs 461a and 466a are formed by extending the surface of the drawer plates 461 and 466 fixed to the battery cell terminals upward and bending the drawer tabs 461a and 466a upward. It is a metal thin plate folded body in which the bent vertical wall portions are drawn tabs 461a and 466a by being bent into an L shape. However, since the battery cell electrode is located in the upper stage from the battery cell arranged in the lower stage, the same extraction method cannot be adopted. Although it is not impossible to employ this, it is because it is necessary to ensure sufficient insulation because the extraction plate is overlaid on the connection tab arranged on the electrode of the upper cell portion. Therefore, in this embodiment, the drawer plate 471 from the terminal surface 471b of the lower cell (see also FIG. 13 (1)) is extended to the front side and then bent to the left at a right angle to form the side surface portion 471c. Extend to the top. That is, the drawer plate 471 is extended upward with the side surface on the short side as viewed from the top side of the separator 445, bent from the front side surface to the rear side of the separator 445 to form the horizontal plane portion 471d, and the horizontal plane portion 471d A drawer plate 471a was formed by extending in a tab shape at right angles. The drawer plate 471a is soldered by passing through a slit-like through hole 152c formed in the circuit board 150 from the back surface to the front surface. The longitudinal directions of the drawer tabs 471a and 476a are arranged so as to be parallel to the short side of the substantially rectangular shape. By forming in this way, the drawer plate 471 from the lower battery cell can be arranged without interfering with the drawer plate of the upper battery cell.

  The drawer plate 476 from the lower minus terminal is pulled out in the same manner and pulled out to the drawer tab 476a. In this way, by pulling the separator upwards using not only the left and right side surfaces but also the front side surface and the rear side surface, the output from the battery cells arranged in the lower stage, the upper part of the upper battery cell, That is, it can be efficiently pulled out to the upper surface of the separator. In this embodiment, the drawer plate 471 is further formed with a heat radiating portion 471h having a surface with an enlarged surface area so as to extend to the left from the portion indicated by the dotted line. This is because the drawer plate 471 is formed of a thin metal plate and is used to cool the battery cell whose temperature has increased by using this. Since the position where the heat radiating portion 471h is provided is just the position facing the slit 104 (see FIG. 4) of the lower case 101, it is advantageous in terms of heat dissipation. In addition, when the temperature rise of a battery cell does not become a problem, it is not necessary to provide the left part (radiation part 471h) rather than the dotted line of the drawer | drawing-out board 471. The drawer plate 471 is further provided with a portion where the width of the connection path is greatly reduced, that is, a fuse portion 471e. The fuse portion 471e is formed by forming a cutout portion 471f from the right side of the drawer plate 471 and forming a cutout portion 471g from the left side to sufficiently narrow the width of the remaining portion (width in the left-right direction). Has a function as a power fuse. When a specified current or more flows through the fuse portion 471e for a predetermined time or longer, the fuse portion 471e is blown first, thereby shutting off one of the output paths from the battery pack 100 (output from the lower cell unit). A similar fuse function is similarly provided in the vicinity of the drawer tab 461a of the drawer plate 461 (see FIG. 13A) from the plus terminal of the upper cell unit 146. Oval connecting plates 462, 464, 473, and 474 for connecting the electrodes of adjacent battery cells are formed of a thin metal plate such as stainless steel and fixed by spot welding to the battery cells. Is done.

  The upper cell unit 146 is provided with a drawer tab 461a for positive output and a drawer tab 466a for negative output. The lower cell unit 147 is provided with a pull-out tab 471a for positive output and a pull-out tab 476a for negative output. In this embodiment, the installation positions of the drawer tabs 461a, 466a, 471a, and 476a are also devised. The left-right center line of the circuit board 150 or the center line of the positive terminal pair (162, 172) and the negative terminal pair (167, 177) is defined as a left-right center line A1 indicated by a dotted line. In addition, a dotted line indicates a line connecting two central positions of the center position between the leg portions of the upper positive terminal 162 and the lower positive terminal 172 and the center position between the legs of the upper negative terminal 167 and the lower negative terminal 177. The virtual line A2 is shown. When the left and right center lines A1 and the leg center line A2 in the front-rear direction are drawn, the upper cell unit 146 has a positive lead tab 461a in the region where the legs of the upper positive terminal 162 are located, and the lower positive terminal The positive lead plate 471a of the lower cell unit 147 exists in the region where the 172 legs are located. By arranging the drawing tabs 461a and 471a in this manner, the drawing tab 461a and the upper positive terminal 162, and the drawing plate 471a and the lower positive terminal 172 can be efficiently connected by a wiring pattern arranged on the circuit board 150. Similarly, there is a negative lead tab 476a of the lower cell unit 147 in the region where the leg of the upper negative terminal 167 is present, and the negative electrode of the upper cell unit 146 in the region where the leg of the lower negative terminal 177 is present. There is a drawer tab 466a. By arranging the drawing tabs 476 a and 466 a in this way, the upper negative terminal 167 and the lower negative terminal 177 can be efficiently connected with the wiring pattern arranged on the circuit board 150.

  FIG. 15 is a perspective view showing a state in which the circuit board 150 is fixed to the separator 445, and shows a state seen from the upper right rear. Here, the soldered portions to the end portions 497b and 498b of the lead wires 497 and 498 (see FIG. 14) which could not be seen in FIG. 14 will be confirmed. Concave portions 150c and 150d for positioning the circuit board 150 with respect to the separator 445 are formed on the left and right edge portions near the center when viewed in the front-rear direction of the circuit board 150, and convex portions 445c and 445d formed on the separator 445 are formed on them. Engage. Further, an abutting portion 445 e that holds the front end of the circuit board 150 is formed on the front side of the separator 445, and abuts against the front edge portion of the circuit board 150. The drawer plate 461 is formed with a terminal surface 461b extending in parallel with the electrode of the battery cell, and a horizontal surface portion 461c bent from the terminal surface 461b to the upper side of the separator 445 in a right angle direction, with the horizontal surface portion 461c facing upward. The drawer tab 461a was formed by extending in a tab shape at right angles. The fuse portion 461d is formed by forming a cutout portion 461e by cutting out a part of a horizontal plane from the front side, thereby reducing the width (distance in the front-rear direction) of the fuse portion 461d. In addition to the drawer plate 461, the other drawer plates 466, 471, and 476, and the connection plates 462 to 465 and 472 to 475 are formed by pressing a thin plate such as stainless steel. Therefore, it is not necessary to add separate fuse elements to the upper cell unit 146 and the lower cell unit 147.

  FIG. 16 is a view for explaining a connection method of the battery pack 100 to the drawer plates 461, 466, 471, 476 and the positive terminals (162, 172) and the negative terminals (167, 177). (1) is the figure seen from the front side, (2) is the figure seen from the back side. In the connection terminal group, illustration of connection terminals other than the positive electrode terminals (162, 172) for discharge and the negative electrode terminals (167, 177) is omitted. A lead-out tab 461 a serving as a positive output of the upper cell unit 146 is connected to the circuit board 150 at a region circle 2 on the rear side of the upper positive terminal 162. Accordingly, as shown by the dotted line, the extraction tab 461a and the upper positive terminal 162 can be connected at a short distance in a straight line. A lead-out tab 466 a serving as a negative output of the upper cell unit 146 is connected to the circuit board 150 at a region circle 3 in front of the lower negative electrode terminal 177. Therefore, as shown by the dotted line, the drawer tab 466a and the lower negative terminal 177 can be connected at a short distance. A lead-out tab 471 a serving as a + output of the lower cell unit 147 is connected to the circuit board 150 at a region circle 1 on the front side of the lower positive electrode terminal 172. Therefore, as shown by the dotted line, the extraction tab 471a and the lower positive terminal 172 can be connected at a short distance. A pull-out tab 476 a serving as a negative output of the lower cell unit 147 is connected to the circuit board 150 at a region circle 4 on the rear side of the upper negative terminal 167. Therefore, as shown by the dotted line, the drawer tab 476a and the upper negative terminal 167 can be connected at a short distance. As described above, since it can be linearly connected to the power connection terminals (162, 167, 172, 177) as indicated by the dotted lines shown on the circuit board 150, the thick wiring pattern without crossing those wiring patterns. Can be arranged efficiently.

  FIG. 17 is a view showing the shape of the connection terminal group (161 to 162, 164 to 168) and the substrate cover 180 arranged around the connection terminal group (161 to 162, 164 to 168), and (1) is a perspective view as seen from the upper left front side. ) Is a perspective view seen from the upper right rear. Although illustration of the circuit board 150 is omitted here, after the legs of the plurality of connection terminal groups (161 to 162, 164 to 168, 171, 172, and 177) are fixed to the circuit board 150 by soldering, A substrate cover 180 is attached around the connection terminal. The substrate cover 180 is manufactured by integral molding of a non-conductor, for example, a synthetic resin, and protects the connection terminals, particularly the legs, from being electrically short-circuited so as not to cause an electrical short circuit. . The purpose of providing the substrate cover 180 is to partition the connection terminals with an insulator. Accordingly, a plurality of partition walls 182 to 189 extending in the vertical direction are arranged, and these are connected by the connecting member 181 on the front side. The flat upper surface 181a of the connecting member 181 is formed so as to be flush with the lower step surface 111 (see FIG. 3) of the upper case 110, and relative to the main body side terminal portion extending from the lower step surface 111 to the connecting member 181. Easy to move. The horizontal wall of the connecting member 181 is held in a state of floating from the circuit board 150, and a plurality of leg portions 181b to 181f are formed so that a gap is formed between the lower surface of the horizontal wall of the connecting member 181 and the circuit board 150. In addition, fitting ribs 191a (see FIG. 17 (2)) and 191b for alignment that are fitted so as to sandwich the left and right sides of the circuit board 150 are formed at both left and right ends of the connecting member 181. In addition, a vertical wall portion 185a extends to the front side in the vicinity of the left and right center of the connecting member 181 so as to partition the center of the upper surface 181a. The tip of the vertical wall portion 185a is used for alignment when an external charging device (not shown) is mounted.

  The substrate cover 180 also functions as a cover that closes the opening of the unused area (the slot 123 in FIG. 3). As shown in FIGS. 17 (1) and (2), vertical wall portions 184a and 184d are formed at portions corresponding to the slots 123, and a closing plate 184c for connecting them on the rear side. In this way, the substrate cover 180 blocks the unused area (slot 123 in FIG. 3), and makes it difficult for dust and dust to enter the case of the battery pack 100 from the empty slot.

  As can be understood from FIG. 17 (2), the rear positions of the plurality of partition walls 182 to 189 are located further rearward than the rear positions of the connection terminals (161 to 168). Although illustration of the circuit board 150 is omitted here, the lower side portions of the respective partition walls 182 to 189 extend to positions where they contact the surface of the circuit board 150. Step portions 192 a and 192 b are formed on the left side of the partition wall 188 (see FIG. 17 (1)) and on the right side of the partition wall 182. The step portions 192a and 192b become contact portions with which the projecting portions 516a and 516b of the terminal portion described with reference to FIG. 29 come into contact. The power terminals (161, 162, 167) for transmitting power are formed of a thick metal plate as compared with the signal terminals (164 to 166, 168) that only transmit signals. The power terminal of this embodiment has an electrically independent upper terminal (161, 162, 167) and a lower terminal (171, 172, 177: see FIG. 14 for both), each of which is an arm adjacent in the left-right direction. Has a group. The board cover 180 protects the power terminals from short-circuiting with the terminals (power terminals or signal terminals) adjacent in the left-right direction, and the arm set of the upper terminals (161, 162, 167) adjacent in the vertical direction. A short circuit with the arm set of the lower terminals (171, 172, 177: see FIG. 14) is prevented. Therefore, the partition walls (182, 183, 184, 187, 188) adjacent to the power terminals in the substrate cover 180 are high in the upward direction, and also extend in the horizontal direction as shown in FIG. Horizontal wall portions 182b, 183b, 183c, 184b, 187b and 188b are further formed.

  FIG. 17 (3) is a front view of the connection terminal group (161 to 162, 164 to 168) and the substrate cover 180. Of the partition walls, the partition walls 185 and 186 disposed between the signal terminals are walls having a low height H2 from the upper surface 181a, and the upper end positions thereof are below the signal terminals (164 to 166) and the LD terminal 168. The position is lower than the side arm. On the other hand, the partition walls 182 to 184 and 187 to 189 adjacent to the power terminal are wall portions having a height H3 from the upper surface 181a, and the upper end positions thereof are the lower positive terminals 171 and 172 and the lower side. It is located above the upper end position of the negative electrode terminal 177 and is located below the arm portions of the upper positive terminals 161 and 162 and the upper negative terminal 167.

  As described in FIGS. 6 to 12, the power terminals of the connection terminal group are arranged such that the legs of the upper positive terminals 161 and 162 and the lower positive terminals 171 and 172 are arranged in the front-rear direction, and the respective arm sets are arranged vertically. It arrange | positions so that it may space apart in a direction. Similarly, the leg portions of the upper negative terminal 167 and the lower negative terminal 177 are arranged in the front-rear direction, and the arm sets are arranged so as to be separated in the vertical direction. When the battery pack 100 is attached to the electrical equipment body having a rating of 18 V, the potentials of the arms of the upper positive terminals 161 and 162 and the upper negative terminal 167 and the potentials of the lower positive terminals 171 and 172 and the lower negative terminal 177 Therefore, there is no problem even if the upper terminal component and the lower terminal component are in contact with each other. However, when the battery pack 100 is attached to the electrical equipment body having a rating of 36 V, the potentials of the upper positive terminals 161 and 162 and the lower positive terminals 171 and 172 are different, and the potentials of the upper negative terminal 167 and the lower negative terminal 177 are different. Therefore, it is important to prevent a short circuit due to contact between the upper and lower arms. It is also important to have a shape that does not easily cause a short circuit due to the insertion of foreign matter. Therefore, the substrate cover 180 of the present embodiment includes partition walls 182 to 184 and 187 adjacent to the power terminals (positive terminal and negative terminal) among the plurality of partition walls 182 to 189 formed to extend upward. As for 188, the upper end position was formed large upward so as to be the height H3, and was extended greatly to the rear side. Further, horizontal wall portions 182b, 183b, 183c, 184b, 187b, and 188b extending in the horizontal direction from the upper end position of the vertical wall portions 182a, 183a, 184a, 187a, and 188a of the partition walls 182 to 184, 187, and 188 are also formed. did.

  The partition wall 182 has a vertical wall portion 182a and a horizontal wall portion 182b, and its cross-sectional shape is L-shaped. The horizontal wall portion 182b extends in the horizontal direction so as to reach the space between the arm portions of the adjacent power terminals (upper positive terminal 161, lower positive terminal 171) from the vicinity of the upper end of the vertical wall portion 182a. The The partition wall 183 has a T-shaped cross section, and is formed by a vertical wall portion 183a and horizontal wall portions 183b and 183c extending in both directions from the upper end portion of the vertical wall portion 183a. The horizontal wall portion 183b extends to the side close to the adjacent horizontal wall portion 182b, and the tip reaches the space between the arm portions of the upper positive terminal 161 and the lower positive terminal 171. Similarly, the horizontal wall portion 183c extends to the side close to the adjacent horizontal wall portion 184b, and the tip reaches the space between the arm portions of the upper positive terminal 162 and the lower positive terminal 172. When the positive electrode terminal group is viewed from the front as shown in FIG. 17 (3), the right side surface position of the upper positive terminal 161 and the right side surface position of the lower positive terminal 171 are in the same position. The left end position 182c of the horizontal wall portion 182b is located on the left side of the right side surface position of the upper positive terminal 161 and the lower positive terminal 171. Is extended to the length of At this time, the horizontal wall portion 182b is positioned above the arm portion 171a of the lower positive terminal 171.

  As can be seen from FIG. 17B, the lengths of the vertical wall portion 182a and the horizontal wall portion 182b in the front-rear direction are formed longer than the length of the lower positive electrode terminal 171 in the front-rear direction, and the front end position thereof is the lower positive electrode. The terminal 171 is located at substantially the same position as the tip of the arm, and the rear end position is behind the rear end position of the lower positive terminal 171. In this way, the vertical wall portion 182a covers the entire right side surface and the entire left side surface of the lower positive electrode terminal 171 and covers the upper portion except for the space where the device side terminal near the center of the left and right is inserted. . Here, only the shapes of the vertical wall portion 182a and the horizontal wall portion 182b of the lower positive electrode terminal 171 portion are mentioned, but the lower positive electrode terminal 172 also includes the entire right side surface, the entire left side surface, and the upper portion excluding the central portion. Since the partition walls 183 and 184 are provided so as to be covered, even if an external force is applied to the lower positive terminals 171 and 172 and a force that bends them is applied, it can be effectively held by the substrate cover 180. Therefore, it is possible to greatly reduce the possibility that the lower terminal part and the upper terminal part for power transmission are unintentionally short-circuited.

  The negative electrode terminal side (167, 177) has the same idea as the positive electrode terminal side (161, 162, 171, 172), and large partition walls 187, 188 are provided on the left and right sides of the negative electrode terminal. The partition wall 187 has the same shape as that of the partition wall 182 and is formed by a vertical wall portion 187a and a horizontal wall portion 187b, and has a L-shaped cross section. The horizontal wall portion 187b is formed to extend from the upper end portion of the vertical wall portion 187a to the negative electrode terminal side. The partition wall 188 is formed symmetrically with the partition wall 187, and is formed by a vertical wall portion 188a and a horizontal wall portion 188b. The horizontal wall portions 187b and 188b are sized so that the tip end portion enters the space between the arm portion set of the upper negative electrode terminal 167 and the arm portion set of the lower negative electrode terminal 177. Thus, the negative electrode terminal as the power terminal Since the partition walls 187 and 188 are formed so as to cover the periphery of (167, 177), even if a strong external pressure is applied to the upper negative terminal 167 or the lower negative terminal 177 and it moves in the front-rear direction (bent), The possibility of occurrence of a short circuit phenomenon can be greatly reduced by the presence of the wall portions such as the horizontal wall portions 187b and 188b.

  The partition walls 185 and 186 between the signal terminal groups (164 to 166) have only a low height H2 in the upward direction. This is because the degree of danger at the time of a short circuit is smaller than that on the power terminal side, so that the necessity for insulation is low. Further, since each of the signal terminal groups (164 to 166) is one component and the upper arm portion and the lower arm portion have the same potential, it is necessary to worry about a short circuit between the upper and lower arm portions. Is low. The partition wall 184 includes vertical wall portions 184a and 184d, and is connected by a closing plate 184c and a rear connection plate 184e. The closing plate 184c is a flat plate extending vertically and horizontally, and has an effect of closing an empty space between the upper positive terminal 162 and the T terminal 164 (internal space of the empty slot 123 in FIG. 3). Near the upper end of the vertical wall portion 184a, a horizontal wall portion 184b extending to the positive terminal side is formed.

  The connecting member 181 connects the front side portions of the vertical wall portions 182a, 183a, 184a, 184d, 185, 186, 187a, and 188a located between the connection terminals. The horizontal wall forming the upper surface 181 a of the connecting member 181 is in a state of being floated above the circuit board 150. The lower edge portions of the vertical wall portions 182a, 183a, 184d, 185, 186, 187a, 188a and 189 are positioned so as to contact the circuit board 150 (not shown). The lower portion of the connecting member 181 is solidified after being filled with a liquid curable resin that covers the upper surface of the circuit board 150 as will be described later with reference to FIG. By solidifying the curable resin, the vicinity of the lower ends of the plurality of vertical wall portions 182a, 183a, 184a, 184d, 185, 186, 187a, 188a, and 189 and the circuit board 150 are firmly fixed. A plurality of leg portions 181b to 181f are formed on the front wall surface of the connecting member 181, and a space between the leg portions 181b to 181f is a notch. In this way, the leg portions 181b to 181f are not wall portions continuous in the left-right direction, but the notch portions are formed so that the liquid resin is evenly distributed to the rear portion and the front portion of the circuit board 150. It is to make it. Since the liquid resin has a relatively low viscosity, the resin flows in the front-rear direction through the legs 181b to 181f (details will be described later).

  FIG. 18 is a diagram of the substrate cover 180 alone, and (1) is a perspective view seen from the upper left front. In (1), the length L1 in the front-rear direction of the horizontal wall portions 182b, 183b, 183c, 184b, 187b, 188b is equal to the arm portions 265, 266 of the upper terminal component 260 shown in FIG. The length corresponds to the length of the arm portions 285 and 286 of 280. Here, the front ends of the horizontal wall portions 183b, 183c, 184b, 187b, 188b are the front end positions of the arm portions 265, 266 of the upper terminal component 260 and the arm portions 285, 286 of the lower terminal component 280 shown in FIG. The rear end of the upper terminal component 260 shown in FIG. On the partition wall 184, a closing plate 184c extending in the vertical direction and a rear connection plate 184e are formed on the rear side. A space 184f is formed between the rear connection plate 184e and the closing plate 184c.

  FIG. 18B is a perspective view of the substrate cover 180 alone as viewed from the lower right front. As can be seen from this figure, the bottom side positions of the partition walls 182 to 189 are the same as the bottom side positions of the leg portions 181b to 181f, and the board cover 180 is placed such that the bottom side part contacts the surface of the circuit board 150. Is done. Two fitting ribs 191a and 191b that protrude further downward are formed on the legs 181b and 181f, and the circuit board 150 is positioned in the space between the opposing fitting ribs 191a and 191b, whereby the board cover 180 is formed. Positioning in the left-right direction is performed. A bottom plate 184g is provided between the vertical wall portions 184a and 184d, and closes the lower surface of the slot 123 (see FIG. 3) that is not used.

  FIG. 18 (3) is a front view of the substrate cover 180 alone. The board cover 180 secures the connection terminal groups (161 to 162, 164 to 168, 171 to 172, 177) to the circuit board 150 after the connection terminal groups are fixed to the circuit board 150, that is, as shown in FIG. After that, the circuit board 150 is mounted by sliding it from the front side toward the connection terminal group. Therefore, the board cover 180 can be mounted without contacting the arm portion, the right side surface, and the left side surface of the connection terminal group, and the arm, right side surface, and left side surface of the connection terminal group are usually mounted after mounting. It is a positional relationship that sometimes does not contact. The height H7 of the fitting ribs 191a and 191b is equal to or greater than the plate thickness of the circuit board 150 (not shown).

  FIGS. 19A and 19B are diagrams showing the connection terminal group and the substrate cover 180 disposed around the connection terminal group. FIG. 19A is a top view, and FIG. 19B is a rear view. The positive electrode terminal pair (161, 171) for charging is arranged slightly offset forward from the adjacent positive electrode terminal pair (162, 172). This is due to space limitations and avoids the range of movement of the latch mechanism (not shown) immediately behind the positive terminal pair (161, 171). Therefore, if there is no space restriction, the positive electrode terminal pair (161, 171) may be arranged so that the front end positions of the positive electrode terminal pair (162, 172) and the negative electrode terminal pair (167, 177) are aligned. Further, the LD terminal 168 is different in size from the other signal terminals (T terminal 164, V terminal 165, LS terminal 166) and is formed slightly smaller. This is also due to space limitations, and a latch mechanism (not shown) arrives immediately behind the LD terminal 168 to avoid it. Because of the small LD terminal 168, the partition wall 189 is also formed with a small length in the front-rear direction.

  FIG. 20A is a right side view of the connection terminal group and the substrate cover 180 disposed around the connection terminal group. Here, the portion of the substrate cover 180 is hatched except for the vertical wall portion 185a in the vicinity of the left and right center so as to be distinguished from the connection terminal portion. As can be seen from this figure, the right side of the lower positive terminal 171 is almost entirely covered by the partition wall 182 of the substrate cover 180. The upper positive terminal 161 also covers the lower part of the arm set (161a, 161b) except for the rear end part. Since the circuit board 150 is not shown in the figure, the legs of the upper positive terminal 161 and the lower positive terminal 171 are visible, but actually these legs are located inside the through holes of the circuit board. Will be placed. FIG. 20 (2) is a left side view. Again, since the partition wall 189 is provided on the left side of the LD terminal 168, most of the portion is covered. Further, it can be understood from the drawing that the upper position of the partition wall 188 reaches the position between the arm portion 167b of the upper negative terminal 167 and the arm portion 177b of the lower negative terminal 177.

  FIG. 21 is a diagram for explaining a situation in which the device side terminals are inserted into the substrate cover 180, and shows the vicinity of the upper positive terminal 162 and the lower positive terminal 172. In the partition walls 183 and 184 located on the left and right sides of the upper positive terminal 162, the horizontal wall 183c and the arm 172a, 172b of the lower positive terminal 172 and the horizontal wall 183c, 184b is formed. The space | interval of the horizontal direction of the horizontal wall parts 183c and 184b is L2. As indicated by the dotted line, the terminal portion 52a of the positive electrode input terminal 52 is inserted between the arm sets 162a and 162b between the horizontal wall portions 183c and 184b. Here, since the thickness of the terminal portion 52a is TH1, a relationship of TH1 <L2 is established, and L2 is set to be about twice as long as TH1. As a result, even if the terminal portion 52a is inserted roughly or some foreign matter is inserted, the minimum interval portion of the arm portions 162a and 162b and the minimum interval portion of the arm portions 172a and 172b are separated by L2 or more in the left-right direction. Can be effectively suppressed. Further, since the front end positions of the horizontal wall portions 183c and 184b are positioned forward by the distance F1 with respect to the front end positions of the arm portions 162a and 162b, the terminal portion 52a of the positive input terminal on the electric device main body side. Is inserted between the arm portions 162a and 162b by the horizontal wall portions 183c and 184b. In this way, the distance between the horizontal wall portions 183c and 184b and the front end position are configured to prevent the arm portions 162a and 162b and the arm portions 172a and 172b from being damaged, and the fitting state of the upper positive terminal 162 and the lower positive terminal 172 Can be kept good for a long time.

  FIG. 22 is a diagram in which only the upper case 110 of FIG. 21A is a perspective view of the upper case 110, and FIG. 21B is a perspective view seen from the direction of arrow B in FIG. In (1), the stepped portion is hatched so that the range is clear. As described with reference to FIG. 17 (3), the power terminals (161, 162, 167) are formed to be higher than the signal terminals (164-166, 168) by a distance H in the upward direction. This is because the power terminal is formed of a plate material thicker than the signal terminal. Therefore, in the shape of the upper surface of the conventional upper case, the upper end portion of the power terminal (161, 162, 167) interferes with the inner wall of the upper surface. Therefore, in this embodiment, the position of the inner wall surface as viewed in the vertical direction of the upper step surface 115 of the upper case 110 is partially shifted upward so as to earn the clearance of the upper portion of the power terminals (161, 162, 167). Configured. Although it is conceivable that only the position of the inner wall surface is a recess recessed upward, if the screen shape of the upper step surface 115 is left as it is, the thickness of a part of the upper step surface 115 of the upper case 110 is insufficient, resulting in local However, the strength may be reduced. Therefore, in this embodiment, convex portions 115a and 115b that protrude outward are formed on the outer surface of the upper step surface 115 and in the vicinity of where the power terminals (161, 162, 167) are located. Thus, since it comprised so that a part of wall surface of the upper stage surface 115 might be shifted to the upper side, an accommodation space can be expanded in an inner side part and the fall of wall surface intensity | strength can also be prevented. In the present embodiment, the protrusion height H4 of the outer wall surface of the upper surface 115 is configured to be smaller than the recess height H5 of the inner wall surface, so that the size of the convex portions 115a and 115b on the upper surface 115 is kept small. It was within the range that can be mounted on the conventional power tool body 1 without any trouble. Further, the upper step surface 115 is not the same surface, and a step is formed so that a partial step portion is formed and the height of the shaded portion is increased, so that the upper step surface 115 is higher than the conventional upper surface of the same plane. In terms of strength, it could be equivalent or equivalent.

  Next, a method for applying a resin to the circuit board 150A will be described with reference to FIG. FIG. 23 is a perspective view of the circuit board 150A. Here, the shape of the connection terminal group mounted on the circuit board 150A and the board cover 180A is slightly different from the structure of the circuit board 150 shown in FIG. Regarding the coating method, the method is the same. On the upper surface (front surface) of the circuit board 150A, a main region 156a and a sub region 156b for mounting a large number of electronic elements (not shown) are provided. The main region 156a is located behind the connection terminal group, and a protection management IC (described later) including a microcomputer is mounted there. The sub region 156b is a region on the front side of the connection terminal group. Here, the entire mounted electronic element is covered with a curable resin. The curable resin is cured from a liquid state, and for example, a urethane resin can be used. In order to uniformly fill the liquid urethane resin on the upper surface of the circuit board 150A, an adhesive resin 155 serving as an embankment for preventing the liquid resin from flowing out is provided on the outer edge portion of the element group first mounted on the circuit board 150A. Adhere to. The adhesive resin 155 continuously adheres, for example, an adhesive extracted in a cylindrical shape through a thin extraction port from the inside of a tube-shaped container along the outer edge of a region where the urethane resin is to be filled. At this time, it is important that the adhesive is applied without any break along the outer edge portion, and one end and the other end are in contact with the substrate cover 180. When the adhesive resin 155 serving as the outer frame is attached to almost the entire circumference of the outer edge portion into which the resin is poured, the urethane resin in a liquid state is poured into the upper surface of the circuit board 150A.

  The amount of the urethane resin to be poured is set to an amount that sufficiently satisfies the range surrounded by the adhesive resin 155. At this time, the outer edges of the corresponding portions are surrounded by the adhesive resins 155a to 155c in the portions that are not desired to be covered with the resin, and the resin poured into the outside is within the range surrounded by the adhesive resins 155a to 155c. Did not reach. If the position where the urethane resin is poured is in the vicinity of the main region indicated by the arrow 156a, the resin does not flow into the range surrounded by the adhesive resin 155a. Further, the substrate cover 180A has a horizontal wall surface on the upper surface floating, the rear side wall surface of the lower portion thereof is in an open state, the front side is a wall surface, and a notch is formed in a part thereof. The resin can flow well from the main region 156a to the sub region 156b. In this way, the entire element mounting surface of the circuit board 150A is covered with resin and then cured, so that the surface area of the circuit board 150A is evenly covered with the resin without gaps and mounted. The protected electronic device can be protected from the influence of water and dust. When a double-sided board is used as the circuit board 150A, the back side may be covered with resin in the same procedure. In addition, a portion of the adhesive resin 155a to 155c from which resin filling is excluded, for example, the vicinity of a screw hole or a soldered portion of a lead wire, is a process after screw tightening is completed or a process after soldering is completed. Sometimes a resin may be applied.

  FIGS. 24A and 24B are perspective views showing a terminal portion 200 according to the second embodiment of the present embodiment. The terminal unit 200 is used for electrical equipment with a rating of 36 V, and the arrangement and basic shape of the terminals are the same as those shown in FIG. 9, and the same components are denoted by the same reference numerals. The terminal unit 200 can be mounted in place of the terminal unit 50 in the electric tool body 30 for 36V. In that case, the connection terminal shape of the battery pack 100 may be the same. In FIG. 24, the portion where the metal terminal is exposed is hatched so that the resin portion and the metal portion can be easily distinguished. The difference here is the shape of the base 201 made of synthetic resin that holds the metal terminal portions 52a and 54a to 58a and the short bar terminal portions 59b and 59c. The basic shape is the same, and has an upper surface 201a, and recesses 201c and 201d parallel to the upper surface 201a are formed on the front side and the rear side in the vicinity of the upper surface 201a. Are formed with resin cover portions 202a, 204a-208a. The cover portion is a portion covered with a synthetic resin so that the metal surface is not exposed to the outside, and is formed by molding integrally with the base 201 in the vicinity of the rear end root that does not interfere with the connection terminal of the battery pack 100. Cover portions 202b and 207b are similarly formed in the vicinity of the rear end bases of the terminal portions 59b and 59c of the short bar 59.

  In the second embodiment, a synthetic resin partition 210 is further formed at a position corresponding to an empty slot 123 (see FIG. 3) where no terminal is provided. The partition 210 is a partition plate made of an insulating material for preventing the positive input terminal 52 and the terminal portion 59b of the short bar 59 from being short-circuited with other terminal portions. The material of the metal terminal portions 52a, 54a to 58a, 59b, 59c is phosphor bronze for spring, which has high strength, resistance to bending, and high wear resistance. The terminal portions 52a and 54a to 58a and the terminal portions 59b and 59c are firmly fixed by casting on a base 201 made of synthetic resin. In particular, the upper side portion is also cast into the base 201. However, the terminal portions 59b and 59c only extend forward from the rear vertical surface of the terminal portion 200, and the upper side portion and the lower side portion are open. The partition 210 is a wall-shaped part formed by molding integrally with the base 201, and the size of the partition 210 in the vertical direction is larger than the adjacent terminal portion (54a) in the downward direction and the forward direction.

  25 (1) and (3) are perspective views from another angle of the terminal portion 200, and (2) is a front view. As can be seen from the drawings of (1) and (3), horizontal holding portions 204b, 205b, 206b, and 208b extending in the horizontal direction are provided near the lower bases of the resin cover portions 204a, 205a, 206a, and 208a. It is formed. As can be seen from the front view of (2), the lower surfaces of the horizontal holding portions 204b, 205b, 206b, and 208b are as follows. They are formed so as to be flush with each other when viewed in the height direction, and when the battery pack 100 is mounted, the lower surfaces thereof are close to or in contact with the upper surface 181a of the substrate cover 180 (see FIG. 17). As described above, the lower surfaces of the horizontal holding portions 204b, 205b, 206b, and 208b are brought close to or in contact with the substrate cover 180 to improve electrical insulation between adjacent metal terminals, and the terminal portion 200 is provided with the battery pack 100. The range of relative movement in the vertical direction can be limited. Note that predetermined gaps 202c to 207c are respectively opened between the horizontal holding portions 204b, 205b, 206b, and 208b in the left-right direction. Since the connection terminal on the battery pack 100 side sandwiches the terminal portion of the terminal portion 200 from the left and right directions, dust and dust adhering to the metal terminal portion are pushed out to the rear side by the mounting operation of the battery pack 100. As a result, dust and dust easily adhere to the vicinity of the rear base of the metal terminal. Therefore, gaps 202c to 207c are formed so that the attached dust and dust easily fall downward. As can be confirmed from the front view of FIG. 24 (2), the horizontal holding portions 204b, 205b, 206b, and 208b are formed in a so-called tapered shape in which the width in the left-right direction increases from the front to the rear. On the other hand, a horizontal holding portion is not formed on the lower surface of the terminal portions 59b and 59c of the short bar. This is because it is difficult for the terminal portions 59b and 59c to be deformed downward, so that when the battery pack 100 is subjected to a strong impact due to dropping or the like, it is difficult to contact the terminal portions 52a and 57a.

  The partition 210 is substantially rectangular when viewed from the left and right sides, and its upper side 210 a is integrally formed so as to be in contact with the base 201, and the rear side 210 d as a base part is in contact with the base 201. The lower side 210c is formed integrally with the horizontal holding portion 203b. Thus, the partition 210 can be formed simultaneously with the molding of the base 201. A thickness TH (width TH in the left-right direction) of the partition 210 is formed thicker than the plate thickness T6 of the terminal portions 52a and 54a to 58a which are metal portions. The height H6 of the partition 210 is the same as the height of the vertical wall 200a of the terminal portion 200, and the length L6 in the front-rear direction (see FIG. 24 (1)) is substantially the same as the length of the horizontal wall 200b of the terminal portion 200. . In addition, the partition 210 is longer in the front direction and larger in the lower direction than the terminal portions 52a to 58a, 59b, and 59c. The partition 210 is only inserted into the empty slot 123 (see FIG. 3) when the battery pack 100 is attached to the electric tool main body 30, and does not contact any connection terminal of the battery pack 100. . It should be noted that the partition wall 184 of the substrate cover 180 (see FIG. 17) may be configured such that the position of the closing plate 184c is shifted rearward so as not to interfere when the partition 210 is inserted. The two small positive terminal portions (52a, 59b) arranged in the vertical direction may be greatly deformed by a large impact such as dropping of the battery pack 100, but the positive terminal portions (52a, 59b) are related to the material. ) Has a considerably large elastic deformation range and is deformed but hardly bent. In the present embodiment, when the positive terminal portions (52a, 59b) are deformed inward (terminal portion 54a side), the deformation range can be limited by contacting the partition 210.

  FIG. 26 shows a third embodiment of the present invention. The terminal portion 50A shown here is a partial modification of the shape of the terminal portion 50 shown in FIG. 9, and the same reference numerals are assigned to the portions where the same components are used. Here, the terminal portion 52f of the positive electrode input terminal 52A, which is a power terminal, has a length that is only the front half of the terminal portion 52a of FIG. 25, and the terminal portion 79b of the short bar is a rear half of the terminal portion 59b of FIG. Just the length. Thus, since the length of the terminal part 52f and the terminal part 79b was shortened, the terminal part 59b and the terminal part 79b of the short bar were not overlapped when viewed in the vertical direction and when viewed in the front-rear direction. As shown by the arrow 52d, no metal terminal is provided on the rear side of the terminal portion 52a. The same applies to the negative input terminal 57A side. The terminal portion 58f and the terminal portion 79c of the short bar are arranged so as to be displaced in the front-rear direction, and viewed in the vertical direction and the terminal portion 58f and the terminal portion viewed in the front-rear direction. 79c was not overlapped. As indicated by the arrow 50e, no metal terminal is provided on the rear side of the terminal portion 58f.

  26 (2) and 26 (3) are perspective views of the upper terminal component 220 and the lower terminal component 230 corresponding to the terminal portion 50A. Here, the leg portions of the upper terminal component 220 and the lower terminal component 230 are spaced apart in the front-rear direction, and the arm set (225, 226) and the arm set (235, 236) are separated in the vertical direction. The upper terminal component 260 and the lower terminal component 280 shown in FIG. However, the length of the upper arm set (225, 226) in the front-rear direction is short, and the length of the lower arm set (235, 236) in the front-rear direction is increased. FIG. 26 (3) shows a state in which the conventional terminal portion 20 (see FIG. 10) is fitted to the upper terminal component 220 and the lower terminal component 230 shown in (2). Here, when the terminal portion 22a of the positive electrode input terminal 22 is inserted, the position in the front-rear direction of the fitting region of the upper terminal component 220 and the fitting region of the lower terminal component 230 becomes a position separated by a distance L7. If the fitting pressure of the arm set (225, 226) is equal to the arm set (235, 236), the same function as the upper terminal component 260 and the lower terminal component 280 of the first embodiment is realized. Can do.

  Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 27 is a schematic circuit diagram of the battery pack and the electric device main body according to the fourth embodiment. The battery pack 100 has the same configuration as the battery pack of the first embodiment described with reference to FIGS. Here, only the circuit diagram of the battery pack 100 is shown. The electrical device main body is characterized in that a switch circuit, that is, a short bar connection switch 59d is provided in the middle of the short bar 59 in the first embodiment. There is no change in other configurations. A drive unit such as a motor is controlled by a control unit including a microcomputer. This drive unit is connected to a positive input terminal 52 and a negative input terminal 57, and an operation switch 34 such as a trigger switch is provided in these circuits. The short bar connection switch 59d is an additional changeover switch for establishing or releasing the electrical connection between one terminal part 59b and the other terminal part 59c of the short bar 59. Thus, by providing the changeover switch on the short bar 59, various usage methods can be realized.

  The first usage is to configure the short bar connection switch 59d to be turned on or off in conjunction with the trigger switch 34. For example, when the electric device main body has a trigger switch 34 such as an impact driver, even if the battery pack 100 is attached to the power tool main body, if the trigger switch 34 remains off, the negative electrode and the lower cell unit of the upper cell unit 146 Thus, the positive electrode 147 is not connected, and no power is supplied to the positive input terminal 52 and the negative input terminal 57. The second usage is when the short bar connection switch 59d is used as the main switch of the electric device main body. An electric device using the battery pack 100 may use only a main switch without using a trigger switch. In that case, the short bar connection switch 59d may be used as the main switch, or may be configured to operate in conjunction with the main switch. In either the first or second usage, the upper cell unit 146 and the lower cell unit 147 are reliably kept in a disconnected state during storage or transportation, so that the safety of the battery pack 100 is improved. Especially useful for. In addition, since the on / off control is not performed only by the trigger switch 34, the on / off control can also be performed on the short bar 59 side. The power supply can be cut off by controlling the connection switch 59d. The trigger switch 34 and the short bar connection switch 59d may be configured to be fully linked so that the trigger switch 34 is switched on and off and the short bar connection switch 59d is switched on and off without a delay time. In this case, on / off interlock may be realized by a mechanical mechanism, or on / off may be realized at the same timing by an electric circuit configuration. Furthermore, it may be controlled so that the on / off switching of the short bar connection switch 59d corresponding to the on / off switching of the trigger switch 34 is slightly shifted using an electrical circuit configuration. FIG. 28 shows a method of slightly shifting the on / off switching of the short bar connection switch 59d from the on / off switching of the trigger switch 34.

FIG. 28A is a diagram showing the timing of the operation of the short bar connection switch 59d (connection operation 196) and the operation of the trigger switch 34 (trigger operation 197). Each horizontal axis represents time (unit: second) and is shown in the same scale. (1) is a diagram showing the timing of the operation of the short bar connection switch 59d (connection operation 196) and the operation of the trigger switch 34 (trigger operation 197). When using the electric tool, the main switch (not shown) is turned on, and the short bar connection switch 59d is turned on in conjunction therewith. Thereafter, when the operator turns on the trigger switch 34 at times t ₂ , t ₄ , t ₆ , and t ₈ , the motor rotates. When the worker turns off the trigger switch at time t ₃ , t ₄ , t ₇ , t ₉ , the rotation of the motor stops. Turning off the main switch operator (not shown) at time t _10, in the non-connected state the upper cell unit 146 and the lower cell unit 147 of the battery pack 100 because in conjunction therewith shorted bar connection switch 59d also off . Therefore, even if the battery pack 100 is inserted into the electric power tool body, if the main switch is turned off, the series connection between the upper cell unit 146 and the lower cell unit 147 is released.

FIG. 28 (2) shows a short bar connection in the case where the power tool is not a trigger switch that requires continuous operation during work but the power tool has a changeover switch that is only on or off, such as a grinder or a circular saw. It is a figure which shows the control timing of switch 59d, a microcomputer, and a motor. In a model in which the electric device main body does not have a trigger switch 34 that requires continuous operation by an operator such as a grinder or an electric circular saw, the short bar connection switch 59d can function as a main switch of the electric tool. In that case, the main switch at time t ₁₁ (short bar connected switch 59d) is turned on, the power tool is ready for use. Then, the operating voltage is also supplied to the microcomputer included in the control unit on the power tool main body side, so that the microcomputer 198 is activated. The activated microcomputer 198 is to rotate the motor, to start at time t ₁₂ and Okurashi its timing slightly. When you work at time t ₂₀ is completed, the operator switched to the off side of the main switch (short bar connected switch 59d). Then, since the power supply to the microcomputer is cut off, the microcomputer and the motor are stopped. As described above, by providing a slight time lag until the motor is started with respect to the ON state of the short bar connection switch 59d, it is possible to suppress overcurrent from being concentrated on the contact portion of the short bar connection switch 59d. Further, by turning off the short bar connection switch 59d as the main switch, it is possible to reliably maintain the state where the output of the battery pack 100 is not supplied to the positive electrode input terminal 52 and the negative electrode input terminal 57. If the main switch is turned off, the series connection of the upper cell unit 146 and the lower cell unit 147 is in a released state, which is useful for improving safety during transportation.

  Next, the shape of the terminal holder (500, 550) on the electric device main body side will be described with reference to FIGS. In FIG. 29 (1), the terminal holder 500 has a new shape that can be attached in place of the terminal portion 20 (see FIG. 10) of the conventional electric equipment body, and is for a rating of 18V. The terminal portion 20 shown in FIG. 10 has a shape in which the base 21 made of synthetic resin for fixing the terminal is small, but in the terminal holder 500 of the fifth embodiment, the horizontal wall 501 forming the horizontal plane 501a is front and rear. It is formed larger in the left-right direction. The terminal holder 500 is a member for fixing a plurality of terminals (522, 524 to 528) on the electric device main body side, and casts a metal part having a flat terminal portion by integral molding of a nonconductor such as synthetic resin. It is fixed by inserting. In the terminal holder 500, a flat positive input terminal 522, a T terminal 524, a V terminal 525, an LS terminal 526, a negative input terminal 527, and an LD terminal 528 are arranged in the left-right direction. The battery pack 100 further has a positive electrode terminal for charging (161 and 172 shown in FIG. 14). Since the terminal holder 500 shown here is used for electrical equipment dedicated to discharging, the positive electrode terminal for charging is used. The terminal fitted to (161, 171 in FIG. 4) is not provided. The plurality of terminals (522, 524 to 528) extending forward from the base portion 510 of the terminal holder 500 are firmly fixed so that the rear side portion and a part on the upper side are cast into the horizontal wall 501. On the rear side of the horizontal wall 501, curved ribs 503a to 503d for fixing the terminal holder 500 to the housing on the electric device main body side are formed. Curved ribs 504a and 504b that are curved in the opposite direction to the curved ribs 503a and 503d are formed at positions facing the curved ribs 503a and 503d. By inserting a cylindrical member between the plurality of curved ribs 503a to 503d, 504a, and 504b, the rear side of the terminal holder 500 is fixed to the housing on the electric device main body side. At this time, the front side of the terminal holder 500 is latched by the latching claws 502 on the housing on the electric device main body side. A horizontal plane 515 elongated in the left-right direction is formed on the lower side of the plurality of terminals (522, 524 to 528) and close to the vertical surface 501b. The horizontal surface 515 is manufactured integrally with the base body 510 and is a rectangular horizontal plate that is long in the lateral direction. A protruding portion 516 a that protrudes further to the right side than the right end of the base portion 510 is formed at the right end portion of the horizontal surface 515. Similarly, a protruding portion 516b that protrudes further to the left than the left end of the base portion 510 is formed.

  FIG. 29 (2) is a left side view of the terminal holder 500. In the terminal holder for 18V, horizontal planes 515 that are laterally continuous at the lower side portions of the plurality of terminals (522, 524 to 528) are formed, and projecting portions 516a are formed at the left and right ends of the horizontal plane 515. Connection portions (522b, 524b, 527b, etc.) for soldering are formed at the rear end portions of the plurality of terminals (522, 524 to 528) cast into the rectangular parallelepiped base portion 510. An elongated cylindrical member is inserted in the left and right direction into the curved rib 503d on the lower side of the connecting portion (522b, 524b, 527b, etc.) and the curved rib 504b facing the curved rib 503d, and the cylindrical member is screwed by an electric device or the like. Can be fixed to the housing of the main body.

  FIG. 30 is a view showing the terminal holder 500, (1) is a front view, and (2) is a bottom view. In the terminal holder 500, a horizontal surface (horizontal wall) 515 is further formed below the bottom surface portion 510b connecting the lower sides of the terminals (522, 524 to 528). A concave portion 516 cut out in a concave shape is formed near the center of the horizontal plane 515 in the left-right direction. The recess 516 is a notch formed so as not to interfere with the vertical wall portion 185a (see FIG. 3) of the battery pack 100 when the terminal holder 500 is mounted. Since a part of the rear side and the upper side of the terminal (522, 524 to 528) is cast into the base portion 510, and a part of the rear side of the lower side is cast by the horizontal wall 515, the terminal (522, 524 to 528). ) Is firmly fixed without shaking in the left-right direction. A plurality of terminals (522, 524 to 528) are cast into the base portion 510 so as to penetrate to the rear side. At that time, in the base portion 510 on the rear side of the horizontal surface 515, cavities 532 to 538 and 544 to 546 that are not filled with the resin material are formed. These cavities are unnecessary parts for covering the terminals (522, 524 to 528) to be cast therein, and are formed to reduce the weight of the terminal holder 500. FIG. 30 (3) is a top view and is a portion exposed to the internal space of the housing 3 of the electric power tool body 1. The terminal holder 500 of the fifth embodiment is relatively large, and a stepped surface 506 that is higher upward is formed on the upper surface of the horizontal surface 501a. An outer peripheral side edge portion of the horizontal plane 501a is fixed to the electric tool main body 1 by being sandwiched between opening portions formed in the housing 3 of the electric power tool main body 1. At this time, a rubber seal member (not shown) may be interposed on the outer peripheral surface of the horizontal wall 501 so as to fill a gap between the terminal holder 500 and the housing 3.

  FIG. 31 is a partial side view showing a state where a conventional battery pack 15 is mounted on a power tool body using the terminal holder 500. In the conventional battery pack 15, the connection terminal 18 is fixed on the circuit board 16 of the battery pack 15. The connection terminal 18 has a size corresponding to the terminal portion of the positive input terminal 522. The connection terminal 18 has left and right arm portions 18a, 18b (18b is not visible in the drawing) extending toward the front side of the battery pack in the mounting direction, and a terminal portion of the positive input terminal 522 between the arm portions 18a, 18b. As a result, a good electrical contact state is achieved. When the conventional battery pack 15 is attached to the electric device main body, the horizontal surface 515 is positioned so as to be close to the upper step surface 115 of the upper case 110 (see FIG. 3), and the vertical surface 501b is opposed to the step portion 114 (see FIG. 3). Come to the position to do. At this time, the arm portions 18a and 18b of the connection terminal 18 are fitted so as to sandwich the plate-like positive input terminal 522 from the left and right, thereby establishing an electrical connection state. In the conventional terminal part 20 (refer FIG. 10), since the horizontal surface 515 is not formed, a clearance gap will arise in the part shown by the arrow 517. FIG. However, in this embodiment, since the horizontal surface 515 contacts or is close to the substrate cover 19, the gap between the terminal holder 500 and the substrate cover 19 is filled, and the connection terminal group of the battery pack 15 is in the power tool body 1 side. Limit the range of relative movement. Accordingly, the relative movement amount between the fitting portions of the arm portions 18a and 18b and the terminal portion 27a when the electric tool is in operation is greatly limited, and the occurrence of friction at the fitting portion between the arm portions 18a and 18b and the connection terminal 18 is suppressed. Thus, the life of the battery pack 15 and the power tool main body 1 can be extended by being electrically stabilized. The upward movement of the terminal holder 500 with respect to the battery pack 15 can also be limited by the protrusions 516a and 516b (see FIG. 29). The operation of the protrusions 516a and 516b will be described later with reference to FIG. .

  FIGS. 32A and 32B are views showing the shape of a 36V terminal holder 550 according to a fifth embodiment of the present invention, wherein FIG. 32A is a perspective view seen from below, and FIG. 32B is a left side view. The difference from the 18V terminal holder 550 shown in FIG. 29 is slight, and it may be said that the shape of the resin portion is the same. The only difference is that the positive input terminal 572 and the negative input terminal 577 are narrow in the vertical direction as in the first embodiment, and the lower part of the positive input terminal 572 and the negative input terminal 577 Short bar terminal portions 588b and 588c are provided in parallel. The side surface shape of FIG. 32 (2) is substantially the same, a horizontal surface 565 is formed below the connection terminal group, and protrusions 566a and 566b are formed on the left and right sides thereof.

  33 is a view showing the terminal holder 550 shown in FIG. 32, wherein (1) is a front view, (2) is a bottom view, and (3) is a top view. Here, the positive input terminal 572 and the negative input terminal 577 are formed to have a smaller vertical width than the other terminals (574 to 578), and a terminal portion 588b is formed below the positive input terminal 572 so that the negative input A terminal portion 588c is formed below the terminal 577. The terminal portions 588b and 588c are both end portions of a short bar cast into the base portion 560 of the terminal holder 550, and these are electrically connected. The shape of the bottom part of FIG. 33 (2) is also substantially the same as the terminal holder 550 shown in FIG. The base portion 560 is cast with a plurality of terminals (572, 574 to 578) and a short bar (not shown). A large number of cavities 582 to 588 and 594 to 596 are formed on the rear side of the horizontal plane 565. These hollow portions are portions that are not required to cover the terminals (522, 524 to 528) cast therein, and are formed to reduce the weight of the terminal holder 500. FIG. 33 (3) is a top view and is a portion exposed to the internal space of the housing 32 of the electric power tool body 30. A step surface 556 is formed on the horizontal surface 551 a that is the upper surface of the terminal holder 550.

  FIG. 34 is a diagram for explaining a connection state between the power tool main body using the terminal holder 550 and the connection terminals of the battery pack 100 according to the present embodiment. FIG. 34 (1) is a side view, and (2) is a side view of (1) in which the illustration of the side wall portion of the substrate cover 380 is omitted. Here, the upper positive terminal 162 is fitted only to the positive input terminal 572, and the lower positive terminal 172 is connected to the terminal portion 588b of the short bar. The horizontal plane 565 is positioned so as to be in contact with or close to the lower step surface 111 of the upper case 110 (see FIG. 3) and the upper surface 381a of the substrate cover 380. Also in the terminal holder 550, since the horizontal plane 565 and the protrusions 566a and 566b are formed, the vertical movement of the terminal holder 550 with respect to the battery pack 100 can be restricted.

  Next, another method for limiting the amount of relative movement of the terminal holder 550 with respect to the battery pack will be described with reference to FIG. The method of FIGS. 29 to 34 restricts only the movement in the direction in which the terminal holders 500 and 550 approach the circuit boards 16 and 150, that is, the downward movement. Horizontal planes 515 and 565 were formed. However, the relative movement of the terminal holders 500 and 550 in the direction away from the circuit boards 16 and 150, that is, the upward movement, cannot be restricted only by providing the horizontal surfaces 515 and 565. The terminal holder 550 is held by the housing 32 of the power tool main body 30. At this time, the fixing method of the terminal holder 550 differs depending on the type of the electric tool main body or the electric equipment main body. Usually, an opening for holding the terminal holder 500 is provided on the dividing surface of the split housing, and the terminal holder 500 is inserted into the opening. At this time, in order to improve waterproofness and prevent vibration transmission, not only a method of firmly fixing the opening and the terminal holder 500 but also a rubber seal member may be interposed and held in a slight movable state. . In this case, when the electric tool is placed in a state where large vibrations are generated during work, the terminal holder 550 vibrates slightly at a different period from the electric tool main body side housing, that is, within a movable range by the seal member, and the battery pack. Relative movement occurs between the 100 connection terminals and the plate-like equipment side terminals. In order to suppress the relative movement between the connection terminal and the device-side terminal, it is conceivable to increase the fitting pressure of the connection terminal of the battery pack 100. In this case, it is difficult to attach and remove the battery pack 100. Therefore, in the present embodiment, protrusions 516a and 566a that protrude in the right direction are formed near the left and right ends of the horizontal planes 515 and 565, and protrusions 516b and 566b that protrude in the left direction are formed. The upward movement of the terminal holder 550 is also suppressed. In order to limit the upward movement of the terminal holders 500 and 550, an abutting member (engaged portion) that holds the protruding portions 516a, 516b, 566a, and 566b from the upper side is necessary. In this embodiment, a convex portion is formed on a part of the upper case 110 as the engaged portion, or a convex portion is formed on the substrate cover 380, and a protruding portion 516a is formed below the convex portion. 516b or protrusions 566a and 566b are brought into contact with each other.

  FIG. 35 (1) shows a right side view of the battery pack 100 with the terminal holder 550 attached thereto. Here, the horizontal surface 551 a of the terminal holder 550 is opposed to the upper stage surface 115 of the upper case 110. The battery pack 100 is attached to the electric tool main body 30 by a rail mechanism. FIG. 35B is a cross-sectional view taken along the line CC of FIG. Here, a plurality of device side terminals (572, 574 to 578, 588b, 588c) formed on the terminal holder 550 are fitted with connection terminals (see FIG. 4) on the electric power tool main body 1 side. A horizontal surface 565 is formed on the lower surface of the device side terminals (572, 574 to 578, 588b, 588c), and the horizontal surface 565 contacts the upper surface 381a of the substrate cover 380. However, in the vicinity of the arrows 590a and 590b, the lateral side of the terminal holder 550 is not in contact with the upper case 110.

  36 (1) is a view showing a terminal portion 650 according to a modification of the fifth embodiment, (1) is a sectional view of a portion corresponding to the DD portion of FIG. 35, and (2) FIG. 2 is a partially enlarged view of (1). As can be understood from this figure, the terminal portion 650 is provided with protrusions 666a and 666b in the left-right direction. The upper case 110 is provided with two parallel projecting portions 139a, 139b extending in the front-rear direction, projecting from the vicinity of the upper ends of the projecting portions projecting in the upward direction to the left and right sides. Rails 138a and 138b that engage with the rail grooves on the side are provided. In addition, ribs 140a and 140b serving as engaged portions to be fitted with the terminal portion 650 are provided in the opening formed between the protruding portions 139a and 139b, and the terminal portion 650 is directed upward with respect to the battery pack 100. Prevent relative movement. The downward relative movement of the terminal portion 650 with respect to the battery pack 100 is limited by the protrusions 139a and 139b coming into contact with the step portions 386a and 386b formed on the left and right ends of the upper surface 381a of the substrate cover 380. Here, if the distance between the lower surfaces of the ribs 140a and 140b forming the stepped portions and the upper surfaces of the protruding portions 139a and 139b is 3.0 mm and the height of the protruding portions 666a and 666b is about 2.5 mm, the battery pack 100 can be smoothly attached to and detached from the electric power tool main body 30, and the vertical swing of the terminal holder 550 can be effectively suppressed.

  37 is a view showing a modification in which the terminal portion 650 is fixed to the substrate cover 680, (1) is a sectional view of a portion corresponding to the DD portion of FIG. 35, and (2) is a view of (1). It is a single figure of the terminal part 650, (3) is a left view of the terminal part 650. Here, guide rails 695a and 695b for fitting with the protruding portions 666a and 666b of the terminal portion 650 are formed on both side ends of the substrate cover 680. The guide rails 695a and 695b are concave second rail grooves extending in the front-rear direction, and when the terminal portion 650 is relatively moved so as to slide from the front side of the battery pack 100, the guide rails 695a and 695b The projecting portions 666a and 666b of the terminal portion 650 are inserted into the terminal portion 650. That is, in addition to the power tool main bodies 1 and 30 being engaged by the rail mechanisms for mounting, that is, the rails 138a and 138b and the rail grooves 11a and 11b, the protrusions 666a and 666b of the second rail mechanism and the guidance are provided. The relative movement between the terminal portion 650 and the battery pack 100 was restricted by fitting the rails 695a and 695b. In the side view of FIG. 37 (3), the shape of the terminal portion 650 is smaller than the shape of the terminal holders 500 and 550 of the fifth embodiment shown in FIGS. However, the sizes of the metal terminal portions (for example, the positive electrode input terminal 672 and the short bar terminal portion 688b) constituting the connection terminal are the same. In addition, the horizontal plane 665 is formed below the plurality of metal terminals, and the protrusions 666a and 666b are also formed at the left and right ends of the horizontal plane 665. The terminal holder of the fifth embodiment shown in FIGS. The shape is the same as 500 and 550. By forming in this way, the relative movement range in the vertical direction of the terminal portion 650 attached to the electric tool main body or the electric equipment main body to which the battery pack is attached can be effectively suppressed.

  In FIG. 38, a cushion material 690 is interposed on the lower surface 665a of the horizontal surface 665 of the terminal portion 650A of FIG. The cushion material 690 may be a member that has sufficient elasticity while having good slidability so as not to have a large resistance when the battery pack 100 is attached to the power tool body. Here, a cushion material 690 is attached to the flat lower surface 665b of the terminal portion 650A by an adhesive member such as a double-sided tape. A convex portion 665b having a predetermined length in the front-rear direction is formed in the vicinity of the left and right center of the lower surface 665b. The convex portion 665b is manufactured integrally with the base portion 660A, and is a stopper that protects the cushion material 690 from being compressed more than necessary. As seen from the side view of FIG. 38 (2), the cushion material 690 is on the rear side of the protruding portion 666b and below the base portion 660. However, the total length of the cushion material 690 in the left-right direction may be about half or less of the left-right direction region of the lower surface 665b.

  FIG. 39 is a view showing a terminal portion 650B according to a further modification of the fifth embodiment, (1) is a front view, (2) is a left side view, and (3) is a battery pack 100. It is a left view of the terminal part 650B in a fitting state with the side connection terminal. Here, guide portions 692a to 692c made of synthetic resin are interposed between the upper and lower edges of the positive input terminal 672 and the short bar terminal portion 688b. Similarly, synthetic resin guide portions 697a to 697c were interposed at the upper and lower edges of the negative electrode input terminal 677 and the terminal portion 688c of the short bar. The guide portions 697a to 697c are manufactured using a non-conductive material such as a synthetic resin, and may be formed of a separate member from the base body portion 660 or may be manufactured integrally with the base body portion 660. The guide portions 692a to 692c and the guide portions 697a to 697c are formed continuously from the front portion of the positive input terminal 672 to the vertical wall 661b as shown in the side view of FIG. Therefore, in the metal terminal portion, as shown in FIG. 39 (2), the positive electrode input terminal 672 is exposed between the guide portions 697a and 697b, and the short bar terminal portion 688b is exposed between the guide portions 697b and 697c. It will be. By forming the guide portions 692a to 692c and the guide portions 697a to 697c as described above, the guide portions 692a and 692b are guided upward by the guide portions 692a to 692c as shown in FIG. 39 (3). The positive terminal 162 guides the arms 162a and 162b of the positive input terminal 52, and the upper positive terminal 162 guides the arms 162a and 162b of the positive input terminal 52 between the guide parts 692b and 692c. With this configuration, the connection terminal on the battery pack 100 side can be reliably guided to a predetermined position on the terminal portion 650B when mounted, and further, the device side terminal on the terminal portion and the connection terminal on the battery pack side when the electric tool is operated. Can be greatly suppressed by sliding.

  Next, a sixth embodiment of the present invention will be described with reference to FIGS. In the first embodiment, upper terminals (162, 167) and lower terminals (172, 177) are provided as power terminals (positive and negative terminals), respectively, and the battery pack is mounted on the low-voltage electric tool body. In this case, the upper terminal and the lower terminal are commonly connected to the power terminal of the low-voltage electric tool body. When the battery pack is mounted on the high-voltage power tool body, only one of the upper and lower terminals is connected to the power terminal of the high-voltage power tool body, and the other terminal not connected to the power terminal is short-circuited. Shorted by bar. On the other hand, in the sixth embodiment, the arm portions of the power terminals are not arranged separately in the vertical direction, but are arranged separately in the front-rear direction.

  FIG. 40 is a perspective view for explaining a mounting state of the battery pack 860 of the electric tool of the sixth embodiment. The electric tool includes an electric tool main body 801 and a battery pack 860 attached to the electric tool main body 801, and drives a tip tool and a work device using a rotational driving force by a motor. The electric power tool main body 801 includes a housing 802 as an outer frame that forms an outer shape. A handle portion 803 is formed in the housing 802, and a trigger switch 804 operated by an operator is provided near the upper end of the handle portion 803. A battery pack mounting portion 810 for mounting the battery pack 860 is formed below the handle portion 803.

  Here, the mounting direction 818 of the battery pack 860 is described as the direction in which the battery pack 860 is brought closer to the electric tool main body 801 as in the first embodiment. For convenience of explanation, this is only defined as such. Actually, by holding the battery pack 860 and moving the power tool body 801 forward, relative movement in the same direction as the movement of the arrow 818 is realized. it can. In the present specification, the front, rear, left and right directions of the battery pack 860 are determined based on the mounting direction. On the other hand, the power tool main body side defines front, rear, left and right with reference to the direction when the operator grips. Therefore, it should be noted that when the electric device is a power tool body such as an impact driver, the directions in the front-rear direction are reversed as shown in FIG.

  The shape of the battery pack 860 is different from the battery packs 15 and 100 described in the first embodiment in the arrangement of connection terminals and the latch mechanism. Rails 864a and 864b (in the figure, 864b is not visible) are formed on the left and right sides of battery pack 860. The latch button 865 is formed on the upper rear surface of the battery pack 860, and only one large button is provided at the left and right center. When the battery pack 860 is attached to the electric tool body 830, the battery pack 860 is moved in the direction opposite to the arrow 818 after the latch button 865 is pressed (or the electric tool body 830 is moved away from the battery pack 860). Battery pack 860 can be removed.

  FIG. 41 is a view for explaining a mounting state of the battery pack according to the sixth embodiment to the electric tool. The electric tool main bodies 801 and 830 are provided with housings 802 and 832, handle portions 803 and 833, and trigger switches 804 and 834, and a battery pack mounting portion 810 for mounting the battery pack 860 below the handle portions 803 and 833. , 840 are formed.

  The power tool body 801 operates at a rated voltage of 18V, and the power tool body 830 operates at a rated voltage of 36V. The battery pack 860 contains two sets of cell units in which five 3.6 V lithium ion battery cells are connected in series. By changing the connection of the two sets of cell units in series or in parallel, Both voltage (18V) and high voltage (36V) output can be switched. Since the battery pack 860 is configured to support two voltages, it can be mounted on the 36V-compatible power tool body 830 as indicated by the arrow d4, and can also be mounted on the power tool body 801 as indicated by the arrow d3. In the battery pack mounting portion 810 of the electric power tool main body 801, rail grooves 811a and 811b extending in parallel in the front-rear direction are formed in the left and right inner wall portions, and the terminal portion 820 is formed in a space portion surrounded by the left and right rail grooves 811a and 811b. Is provided. The terminal portion 820 is manufactured by integral molding of a non-conductive material such as a synthetic resin, and has a vertical surface 820a that serves as an abutting surface in the mounting direction (front-rear direction) and a horizontal surface 820b. The horizontal surface 820b is mounted on the battery pack 860. Sometimes it becomes a surface adjacent to or facing the upper surface 862. The terminal portion 820 is provided with a plurality of metal terminals such as a positive electrode input terminal 822, a negative electrode input terminal 827, and an LD terminal (abnormal signal terminal) 828. The positive electrode input terminal 822 and the negative electrode input terminal 827 are formed of a metal flat plate, and the length in the mounting direction is more than twice the length of the terminal portion 20 (see FIG. 2) of the first embodiment. The LD terminal 828 is disposed on the right side of the negative input terminal 827.

  On the upper side of the battery pack 860, a flat lower step surface 861 is formed on the front side, and an upper step surface 862 formed higher than the lower step surface 861 is formed near the center. A connection portion between the lower step surface 861 and the upper step surface 862 is formed in a stepped shape, and a slot group for inserting a device-side terminal is disposed in the stepped portion. The slot group is formed with large slots 872 and 877 such as notches that are long in the front-rear direction, and a slot 878 that is about half the length of them. Slot 872 becomes the first slot for the positive terminal, slot 877 becomes the second slot for the negative terminal, and slot 878 becomes the third slot for the LD terminal. In the cutout slots 872 and 877, there are provided a plurality of connection terminals that can be fitted to the device side terminals on the power tool main bodies 801 and 830 side. Although only three slots are provided here, it may be configured to further provide slots. Rails 864 a and 864 b are formed on the right side surface and the left side surface of the upper stage surface 862. The rails 864a and 864b are convex portions that protrude rightward and leftward. A raised portion 863 is provided on the rear side of the upper stage surface 862, and a latch button 865 is provided on the rear side thereof.

  The power tool main body 830 operates at a rated voltage of 36V. The electric tool main body 830 is provided with two sets of connection terminals inserted in the positive side slot 872 and the negative side slot 877, separated from each other in the front-rear direction, based on the same idea as the first embodiment. The connection terminals corresponding to the positive electrode side slot 872 are one terminal portion 859b of a short bar arranged on the front side and a positive electrode input terminal 852 arranged on the rear side. Similarly, the connection terminals corresponding to the negative side slot 877 are one terminal portion 859c of a short bar arranged on the front side and a negative input terminal 857 arranged on the rear side. In the first embodiment, the positive input terminal and the short bar and the negative input terminal and the short bar are arranged at a distance in the vertical direction, but in this embodiment, these are arranged in the front-rear direction, that is, the mounting direction of the battery pack 860. And in a direction parallel to each other at a predetermined distance.

  FIG. 42 is a perspective view showing a connection state of the power terminal to the electric tool main body, (1) shows a state where the battery pack 860 is mounted on the electric tool main body 801 for 18V, and (2) shows a state for 36V. A state in which the battery pack 860 is attached to the power tool main body 830 is shown. Here, the mounting direction of the battery pack 860 is two arrow directions indicated by dotted lines. Inside the positive side slot 872 of the battery pack 860, a front side positive terminal 882 and a rear side positive terminal 892 are arranged as power switching terminal groups so as to be separated in the front-rear direction. Similarly, in the negative side slot 877, a front negative terminal 887 and a rear negative terminal 897 are arranged in the front-rear direction as a power switching terminal group. Inside the battery pack 860, an upper cell unit 146 and a lower cell unit 147 constituted by five lithium ion battery cells are accommodated. The positive output of the upper cell unit 146 is connected to the rear positive terminal 892 and the negative output is connected to the front negative terminal 887. The positive output of the lower cell unit 147 is connected to the front positive terminal 882, and the negative output is connected to the rear negative terminal 897.

  The device side terminal of the electric power tool main body 801 includes a positive electrode input terminal 852, a negative electrode input terminal 857, and a short bar 859. These functions are basically the same as the configuration of the first embodiment, and the terminal group (852, 857, 859b, 859c) of the electric power tool main body is relatively moved as indicated by the arrow 855, and the dotted line arrow is displayed. As shown, the battery pack 860 is configured to be attached to the connection terminal group (882, 887, 892, 897). About the terminal group (852, 857, 859b, 859c) of the electric power tool main body, only the metal terminal portion is illustrated, not the entire terminal portion 850 (see FIG. 41). The positive electrode input terminal 852 is a metal plate bent in a crank shape, and a terminal portion 852a that fits with the front positive electrode terminal 882 is formed on one end side, and a terminal portion 852c for wiring to the motor 836 side is formed on the other end side. It is formed. Between the terminal portion 852a and the wiring terminal portion 852c is a connecting portion 852b extending in the lateral direction, and the entire connecting portion 857b, a part on the rear side of the terminal portion 852a, and a part on the front side of the wiring terminal portion 852c are terminals. It will be cast into the synthetic resin portion of the portion 850 (see FIG. 41). The negative input terminal 857 has the same shape, and a terminal portion 857a that fits with the front negative electrode terminal 887 is formed on one end side, and a wiring terminal portion 857c to the motor 836 side is formed on the other end side. The positive electrode input terminal 852 and the negative electrode input terminal 857 have a plane symmetrical shape. Between the terminal portion 852a and the wiring terminal portion 852c is a connecting portion 857b extending in the lateral direction, and the entire connecting portion 857b, a part on the rear side of the terminal portion 852a, and a part on the front side of the terminal portion for wiring 852c are terminals. The portion 850 is cast on a synthetic resin base. Since the horizontal portion of the short bar 859 is completely cast into the terminal portion 850 together with the connecting portion 852b of the positive input terminal 852 and the connecting portion 857b of the negative input terminal 857, the relative portions of the terminal portions 852a, 857a, 859b, 859c The position, particularly in the front-rear and left-right directions, does not change.

  When the battery pack 860 is mounted, the terminal portion 859b of the short bar 859 is fitted to the rear positive terminal 892 and the rear negative terminal 897. The positive input terminal 852 is fitted with the front positive terminal 882 and the negative input terminal 857 is fitted with the front negative terminal 887. As a result, a series connection circuit of the upper cell unit 146 and the lower cell unit 147 is formed, and a voltage of 36V is supplied to the power tool body 830 side.

  FIG. 42 (2) shows a situation where the battery pack 860 is attached to the low-voltage power tool body 801. FIG. The positive electrode input terminal 822 is a metal plate bent in a crank shape. A terminal portion 822a that is fitted simultaneously with the front positive terminal 882 and the rear positive terminal 892 is formed on one end side, and the motor 806 side is formed on the other end side. Wiring terminal portion 822c is formed. Between the terminal portion 822a and the wiring terminal portion 822c is a connecting portion 822b extending in the lateral direction, and the entire connecting portion 822b, a part of the terminal portion 822a, and a part of the wiring terminal portion 822c are combined with the terminal portion 820. It will be cast into the resin part. Similarly, the negative input terminal 827 is also formed in a crank shape, and a terminal portion 827a, a wiring terminal portion 827c, and a connection portion 827b that are fitted simultaneously with the front negative terminal 887 and the rear negative terminal 897 are formed. As a result, a voltage of rated 18V is supplied to the power tool main body 801 side. Here, the terminal portion 822a is formed to have a sufficient length so as to be fitted simultaneously to the front positive terminal 882 and the rear positive terminal 892, and the terminal portion 827a is fitted simultaneously to the front negative terminal 887 and the rear negative terminal 897. Such a sufficient length is formed.

  The rear positive terminal 892 has an Ω-shaped shape that is inverted from the device-side terminal insertion direction (the direction indicated by the dotted arrow). Here, a rectangular flat plate portion 892a for fixing to the circuit board is formed, and two arm portions 892b and 892d bent upward from the left and right side portions of the flat plate portion 892a are formed. The two arm portions 892b and 892d are bent so as to approach each other in the upward direction, and contact terminal portions 892c and 892e (both see FIG. 45) are formed at the upper end portions of the arm portions 892b and 892d. The contact terminal portions 892c and 892e are substantially rectangular electrodes arranged at predetermined intervals so as to be parallel to each other, and are bent so that the front side and the rear side thereof are separated from the opposing contact terminal portions. The terminal is shaped to be easily fitted from the front to the rear. The metal terminal component used as the rear positive terminal 892 is a common component that is also used in common for the front positive terminal 882, the front negative terminal 887, and the rear negative terminal 897, and is not shown by screws or / and soldered. To a circuit board (not shown).

  FIG. 43 is a diagram for explaining a situation when the battery pack 860 is attached to the 36V-specific power tool main body 830. When the power tool main body 830 is further moved relative to the battery pack 860 from the state of FIG. 42 (1), the terminal portions 859b and 859c of the short bar 859 are first fitted to the front positive terminal 882 and the front negative terminal 887. To do. At this time, since the positive electrode of the upper cell unit 146 and the negative electrode of the lower cell unit 147 are not connected, the power of the battery pack 860 is not transmitted to the electric device main body 831 side.

  When the power tool main body 830 and the battery pack 860 are further moved relative to each other in the direction of the arrow 855, the short bar 859 passes through the front positive terminal 882 and the front negative terminal 887, and the direction of the rear positive terminal 892 and the rear negative terminal 897 Will approach. At this time, the short bar 859 is not in contact with any of the connection terminals, the positive input terminal 852 is not in contact with the front positive terminal 882, and the negative input terminal 857 is not in contact with the front negative terminal 887. Accordingly, even at this time, the upper cell unit 146 and the lower cell unit 147 are not connected, and thus the power of the battery pack 860 is not transmitted to the electric device main body 831.

  When the electric power tool main body 830 and the battery pack 860 are further moved relative to each other in the direction of the arrow 855, the short bar 859 is fitted into the rear positive terminal 892 and the rear negative terminal 897. At the same time, the terminal portion 852a of the positive input terminal 852 is fitted to the front positive terminal 882, and the terminal portion 857a of the negative input terminal 857 is fitted to the front negative terminal 887. As a result, the upper cell unit 146 and the lower cell unit 147 are connected in series, and a DC voltage of 36 V is supplied between the positive electrode input terminal 852 and the front negative electrode terminal 887.

  FIG. 44 is a diagram for explaining a situation when the battery pack 860 is mounted on the 18V-specific power tool main body 801. When the power tool main body 801 is further moved relative to the battery pack 860 from the state shown in FIG. 42 (2), the terminal portions 822a and 827a become the front positive terminals as shown in FIGS. 44 (1) to (2). 882 and the front negative terminal 887 are fitted. At this time, since the positive electrode of the upper cell unit 146 and the negative electrode of the lower cell unit 147 are not connected, the power of the battery pack 860 is not transmitted to the power tool body 801.

  44 (2), when the electric power tool body 801 and the battery pack 860 are further moved relative to each other in the direction of the arrow 825, the terminal portions 822a and 827a that are long in the front-rear direction are in contact with the front positive terminal 882 and the front negative terminal 887. Thus, the direction of the rear positive terminal 892 and the rear negative terminal 897 is approached. In the state of FIG. 44 (2), the terminal portions 822a and 827a are not in contact with the rear positive terminal 892 and the rear negative terminal 897. Accordingly, since the positive electrode of the upper cell unit 146 and the negative electrode of the lower cell unit 147 are not connected at this time, the power of the battery pack 860 is not transmitted to the power tool body 801.

  When the electric power tool main body 801 and the battery pack 860 are further moved relative to each other in the direction of the arrow 825, the terminal portions 822a and 827a come into contact with the rear positive electrode terminal 892 and the rear negative electrode terminal 897. At this time, since the terminal portions 822a and 827a are in a state where both the front positive terminal 882 and the front negative terminal 887 are fitted, a parallel connection circuit of the upper cell unit 146 and the lower cell unit 147 is established, and the positive input terminal A direct current having a rating of 18 V is supplied between 822 and the negative input terminal 827.

  FIG. 45 is a top view of the terminal arrangement on the battery pack 860 side and the terminal shape of the electric power tool main body 830. In order to explain the size and arrangement of the terminals, the scales of the components are shown together. Contact terminal portions 882c, 882e, 892c, 892e, 887c, 887e, 897c, 897e facing the front positive terminal 882, the rear positive terminal 892, the front negative terminal 887, and the rear negative terminal 897, respectively, spaced apart in the left-right direction. Is provided. The contact terminal portions 882c, 892c, 887c, 897c are connected to the right arm portions 882b, 891b, 887b, 897b, and the contact terminal portions 882e, 892e, 887e, 897e are connected to the left arm portions 882d, 891d, 887d, 897d. Is done. The length L7 in the front-rear direction of these contact terminal portions was made sufficiently smaller than the distance L8 between the front positive terminal 882 and the rear positive terminal 892. Since all the terminal parts (882, 892, 887, 897) are common, the length in the front-rear direction of the contact terminal portions 882c, 882e, 892c, 892e, 887c, 887e, 897c, 897e is the same as L7. . The front negative terminal 887 and the rear negative terminal 897 have the same distance L8. The length L9 in the front-rear direction of the terminal portion of the short bar 859 is configured to be sufficiently smaller than the distance L8 between the front terminals (882, 887) and the rear terminals (892, 897). If formed in this way, it is possible to effectively prevent the shorting bar 859 from short-circuiting the front terminals (882, 887) and the rear terminals (892, 897) when the battery pack 860 is mounted. The lengths of the terminal portion 852a of the positive electrode input terminal 852 and the terminal portion 857a of the negative electrode input terminal 857 are preferably at least L9.

  FIG. 45 (2) is a diagram showing a state when the battery pack 860 is attached to the electric tool main body 830. Here, the horizontal portion 859a of the short bar 859 seems to be exposed, but the horizontal portion 859a is cast in the resin portion of the terminal portion (not shown) and thus is not exposed to the outside. As described above, the power terminals (positive terminal and negative terminal) are arranged separately in the front-rear direction, so that they are mounted on the electrical device main body without relying on a mechanical switch mechanism for switching the output voltage. Just get the appropriate output voltage automatically. In addition, it is possible to share a battery pack between electric devices having different voltages.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, in the above-described embodiment, the voltage switching type battery pack of 18V and 36V has been described. However, the voltage ratio to be switched is not limited to this, and other voltage ratios to be switched by a combination of series connection and parallel connection. Also good.

DESCRIPTION OF SYMBOLS 1 Electric tool main body 2 Housing 3 Handle part 4 Trigger switch (operation switch) 5 Motor (drive part)
DESCRIPTION OF SYMBOLS 8 Tip tool holding part 9 Tip tool 10 Battery pack mounting part 11a, 11b Rail groove 12 Curved part 14 Projection part 15 Battery pack 16 Circuit board 18 Connection terminal 19 Substrate cover 20 Terminal part 20a Vertical surface 20b Horizontal surface 21 Base 22 Positive electrode input Terminal 22a Terminal portion 24 T terminal 24a Terminal portion 25 V terminal 25a Terminal portion 26 LS terminal 26a Terminal portion 27 Negative input terminal 27a Terminal portion 28 LD terminal 28a Terminal portion 30 Electric tool main body 32 Housing 33 Handle portion 34 Trigger switch (operation switch) ) 35 Motor (drive unit)
40 Battery pack mounting part 45 Motor 50, 50A Terminal part 51 Base 51b Recessed part 52, 52A Positive input terminal 52a, 52b Terminal part 52c Wiring part 52f Terminal part 54 T terminal 54a Terminal part 54c Wiring part 55 V terminal 55a Terminal part 56 LS terminal 56a Terminal portion 56c Wiring portion 57, 57A Negative input terminal 57a Terminal portion 58 LD terminal 58a Terminal portion 58c Wiring portion 58f Terminal portion 59 Short bar 59a Connection portion 59b, 59c Terminal portion 59d Short bar connection switch 79b, 79c (Short Terminal part 100 of battery bar 101 Battery pack 101 Lower case 101a Front wall 101b Rear wall 101c Right side wall 101d Left side wall 102 Fixing rib 103a-103d Screw hole
104 Slit (wind window) 105 Rib 110 Upper case 111 Lower step surface 113 Opening portion 114 Step portion 115 Upper step surface 115a, 115b Protruding portion 120 Slot group arrangement region 121-128 Slot 131 Stopper portion 132 Raised portion 134 Slit (wind window) 138a, 138b Rail 139a Protruding portion 140a, 140b Rib (engaged portion) 141 Latch 142a, 142b Locking portion 146 Upper cell unit 146a-146e Battery cell 147 Lower cell unit 147a-147e Battery cell 496-499 Lead wire 150, 150A circuit Substrate 150a Front side 150b Back side 150c, 150d Recess 151 Mounting hole 152a to 152f Through hole
153a, 153b Land 155 Adhesive resin 155a-155c Adhesive resin 156a (Resin poured) Main area 156b (Resin poured) Sub area 157 Wiring pattern 160 Slot group arrangement area 161 Upper positive terminal 161a, 161b Arm 162 Upper upper terminal 162a , 162b Arm 164 T terminal 165 V terminal 166 LS terminal 167 Upper negative terminal 167a, 167b Arm 168 LD terminal 171, 172 Lower positive terminal 171a, 171b, 172a, 172b Arm 177 Lower negative terminal 177a, 177b Arm Portion 180, 180A Substrate cover 181 Connecting member 181a Upper surface 181b-181f Leg 182 Partition wall 182a Vertical wall 182b Horizontal wall 182c Left end position 183 Partition wall 183a Vertical wall 183b, 183c Horizontal wall portion 184 Partition wall 184a, 184d Vertical wall portion 184b Horizontal wall portion 184c Blocking plate 184e Rear connection plate 184f Space 184g Bottom plate 185, 186 Partition wall 185a Vertical wall portion 187 Partition wall 187a Vertical wall portion 187b Horizontal wall portion 187b 188a Vertical wall portion 188b Horizontal wall portion 191a, 191b Fitting ribs 192a, 192b Stepped portion 196 (Short bar connection switch 59) connection operation 197 Trigger operation 198 Microcomputer (operation) 199 Motor (operation)
200 Terminal portion 200a Vertical wall 200b Horizontal wall 201 Base 201a Upper surface 201c Recesses 202a and 202b Cover portion 203b Horizontal holding portions 204a to 208a Cover portion 204b Horizontal holding portion 210 Partition 210a Upper side 210c Lower side 210d Rear side 220 Upper terminal component 230 Lower side Terminal part 240 Signal terminal part 241 Base part 242 Bridge part 243 Right side 243a Extension part 243b Bending part 243c Cutout part 244 Left side 245 Arm part base 245b Cutout groove 246 Arm part base 246b Cutout groove 249, 250 Leg part 250a, 250b Stepped portion 251 to 254 Arm portion 256 Solder 260 Upper terminal component 261 Base portion 262 Bridge portion 262a Stepped portion 263 Right side surface 263a Bent portion 264 Left side surface 264c Reinforcement surface 265 Arm portion 65a Plane portion 265d Fitting portion 266 Arm portion 267 Leg portion 280 Lower terminal part 281 Base portion 282 Bridge portion 283 Right side surface 284 Left side surface 284c Cut off portion 285, 286 Arm portion 291 Notch portion 380 Substrate cover 380a Upper surface 386a Step portion 445 Separator 445a Screw hole 445c, 445d Convex portion 445e Plate portion 446 Space 447a, 447b Screw boss 450 Tab holder 461, 466 Lead plate 461a, 466a Lead tab 461b Terminal surface 461c Horizontal surface portion 461d Fuse portion 461e, Cut portion 462, 463 Connection plate 462a, 463a Intermediate drawer tab 464a, 465a Connection terminal 471, 476 Drawer plate 471a, 476a Draw tab 471b Terminal surface 471c Side surface portion 471d Plane portion 471e Fuse portion 471f, 471g Cutout portion 471h Heat radiation portion 472, 473, 474, 475 Connection plate 472a-475a Connection terminal 482a, 482b Insulation sheet 496-499 Lead wire 494b, 496b-498b (Lead wire) end portion 500 Terminal holder 501 Horizontal wall 501a Horizontal surface 501b Vertical surface 502 Latching claws 503a to 503d Curved ribs 504a and 504b Curved rib 506 Step surface 510 Base portion 510b Bottom surface portion 515 Horizontal surface (horizontal wall) 516 Recessed portion 516a and 516b Protruding portion 522 Positive electrode input terminal 524 T terminal 525 V terminal 526 LS terminal 527 Negative electrode input terminal 528 LD terminal 532 Cavity 550 Terminal holder 551a Horizontal surface 556 Step surface 560 Base portion 565 Horizontal surface (guide surface) 5 72 Positive electrode input terminal 577 Negative electrode input terminal 582 Hollow portion 588b, 588c Terminal portion 650, 650A, 650B Terminal portion 660, 660A Base portion 661b Vertical wall 665 Horizontal surface 665a (Horizontal surface) lower surface 665b Protrusion portion 666a, 666b Protrusion portion (engagement) Part)
672 Positive electrode input terminal 677 Negative electrode input terminal 680 Board cover 688b, 688c Terminal portion 690 Cushion material 692a, 692c (Second) guide portion 692b (First) guide portion 695a, 695b Guide rail 697a, 697b Guide portion 801 Electric Tool body 802 Housing 803 Handle portion 804 Trigger switch 806 Motor 810 Battery pack mounting portion 811a Rail groove 818 Mounting direction 820 Terminal portion 820a Vertical surface 820b Horizontal surface 822 Positive electrode input terminal 822a Terminal portion 822b Connection portion 822c Wiring terminal portion 827 Negative electrode input terminal 827a Terminal portion 827b Connection portion 827c Wiring terminal portion 828 LD terminal 830 Electric tool main body 836 Motor 850 Terminal portion 852 Positive input terminal 852a Terminal portion 852c Terminal portion 857 Negative input terminal 857a Terminal portion 857b Connection portion 857c Wiring terminal portion 859 Short bar 859a Horizontal portion 859b, 859c Terminal portion 860 Battery pack 861 Lower surface 862 Upper surface 863 Raised portion 864a, 864b Rail 865 Latch button 872 Positive electrode Side slot 877 Negative side slot 878 Slot 882 Front side positive terminal 882b, 882d Arm part 882c, 882e Contact terminal part (fitting part) 887 Front side negative terminal 892 Rear side positive terminal 892a Flat plate part 892b Arm part 892d Contact terminal part 897 Rear side Negative terminal

Claims (12)

A battery pack having first and second cell units configured by connecting a plurality of battery cells in series.
The positive electrode terminal pair and the negative electrode terminal pair are arranged apart from each other in the left-right direction of the circuit board,
The positive electrode terminal pair and the negative electrode terminal pair each include two terminal components in which the mounting portion to the circuit board is separated in the front-rear direction,
One of the terminal components included in the positive electrode terminal pair and the negative electrode terminal pair is connected to the first cell unit, and the other is connected to the second cell unit. And pattern wiring for connecting to the output terminal of the second cell unit is formed on the circuit board,
The connection points between the lead-out tabs to the output terminals of the first and second cell units and the pattern wiring are respectively arranged in four regions divided by right and left and front and rear center lines of the four terminals,
The pull-out tab having the same potential as the terminal component is pulled out in the same region among the four regions, and the terminal component and the pull-out tab located in the same region are connected in the same region by the pattern wiring. A battery pack characterized by that. A battery having first and second cell units configured by connecting a plurality of battery cells in series, and a plurality of connection terminals connected to equipment-side terminals formed in the mounting portion on the power tool body side A pack,
The positive electrode terminal pair and the negative electrode terminal pair are arranged apart from each other in the left-right direction of the circuit board,
The positive electrode terminal pair includes two terminal components in which a mounting portion to the circuit board is separated from the front and rear,
The negative electrode terminal pair includes two terminal components in which a mounting portion to the circuit board is separated from the front and rear,
One of the terminal components included in the positive electrode terminal pair and the negative electrode terminal pair is connected to the first cell unit, and the other is connected to the second cell unit,
When the first to fourth areas are defined by dividing the front and rear and the left and right sides of the circuit board into one, one extraction tab from the output terminal of the first or second cell unit in each area; A battery pack, wherein the terminal parts are arranged one by one. The drawer tab is provided adjacent to four sides of the circuit board, and a slit-like through hole formed in the circuit board is penetrated from the back side to the front side, and the circuit board is formed on the front side. Soldered to
3. The battery pack according to claim 1, wherein a longitudinal direction of the slit-shaped through-hole is arranged so as to be parallel to a direction in which adjacent sides extend. A plurality of battery cells have parallel non-conductive separators that hold the battery cells in two upper and lower stages so that the directions of adjacent cells are alternately reversed,
The circuit board is disposed on an upper surface of the separator;
The drawer plate having two drawer tabs provided in parallel with the short side of the circuit board extends from the terminal of the battery cell arranged on the lower side to the short side of the separator and extends upward. The battery pack according to claim 3, wherein the battery pack is a folded metal thin plate that reaches the circuit board.   The pull-out tabs on the positive side of the first and second cell units are respectively pulled out in a region where the positive terminal pair of the circuit board is disposed, and in the region where the negative terminal pair of the circuit board is disposed. 5. The battery pack according to claim 4, wherein the pull-out tabs on the negative electrode side of the first and second cell units are each pulled out. The drawer tab is a part formed by bending an end of the drawer plate from a horizontal direction to a vertical direction,
The battery pack according to claim 5, wherein a plurality of tab holding portions are formed on an upper portion of the separator to hold portions of the drawer tabs bent in the vertical direction. The terminal has a base part extending upward from the leg part, and an arm part set extending forward from the base part,
The arm part set of the terminal on the front side and the terminal on the rear side are arranged side by side on the upper side and the lower side,
When the battery pack is attached to the low-voltage electric tool body, the upper arm set and the lower arm set are connected in common to the power terminal of the low-voltage electric tool body,
When the battery pack is attached to the high-voltage electric tool body, only one of the upper arm set and the lower arm set is connected to the power terminal of the high-voltage electric tool body and connected to the power terminal. The battery pack according to any one of claims 1 to 6, wherein the other terminal not connected is short-circuited.   The lead plate has a terminal surface extending in parallel with a surface on which the electrode of the battery cell is disposed, a connection surface that is bent in a direction perpendicular to the terminal surface and disposed on the short side of the separator, and 7. The battery pack according to claim 4, comprising the drawer tab formed on an upper portion of the connection surface. 8.   By forming a fuse portion in which a part of the connection surface is narrowed, the fuse is blown when an excessive current flows for a certain time or more, and the electrical connection between the terminal surface and the extraction tab is cut off. The battery pack according to claim 8.   10. The battery pack according to claim 9, wherein the fuse portion is formed on the extraction tab fixed to a positive output of the first and second cell units.   The battery pack according to claim 10, wherein an extended surface for heat dissipation is further connected to the drawer tab in which the fuse portion is formed. An electric device having a battery pack mounting portion for mounting the battery pack according to any one of claims 1 to 11, and operating the device with electric power from the battery pack.