JP7319896B2 - battery pack - Google Patents

Description

The technology disclosed in this specification relates to battery packs.

Patent Document 1 discloses a battery pack. The battery pack can be attached to the electric device by sliding it backward, and can be removed by sliding it forward. The electrical equipment includes an equipment-side rail extending in the front-rear direction. The battery pack includes a battery-side rail extending in the front-rear direction. The battery-side rail includes a support wall projecting upward from the reference plane of the battery pack, and a flange projecting laterally from the upper end of the support wall. When the battery pack is attached to the electrical device, the reference surface is arranged below the device-side rail, the side surface of the support wall is arranged laterally of the device-side rail, and the lower surface of the flange is , is arranged above the equipment-side rail. The side surface of the support wall is gouged inward at the point of connection with the lower surface of the flange. According to such a battery pack, it is possible to suppress the concentration of stress at the joint between the support wall and the flange.

JP 2019-145461 A

In the battery-side rail, stress tends to be concentrated not only at the connection point between the support wall and the flange, but also at the connection point between the support wall and the support base. In the above-described battery pack, stress concentration at the joint between the support wall and the flange can be suppressed, but stress may be concentrated at the joint between the support wall and the support base, which is the next weakest part. This specification provides a technique capable of suppressing stress concentration at both the connection point between the support wall and the flange and the connection point between the support wall and the support base in the battery-side rail of the battery pack.

The battery pack disclosed in the present specification may be attachable to an electrical device by sliding it backward, and may be removable by sliding it forward. The electric device may include a device-side rail extending in the front-rear direction. The battery pack may include a battery-side rail extending in the front-rear direction. The battery-side rail includes a support base, a support wall projecting upward from the support base, a flange projecting sideways from an upper end of the support wall, and connecting the side surface of the support wall and the lower surface of the flange. and a lower fillet portion connecting the side surface of the support wall and the upper surface of the support base. When the battery pack is attached to the electrical device, the upper surface of the support base may be arranged below the device-side rail, and the side surface of the support wall may be arranged laterally of the device-side rail. Alternatively, the lower surface of the flange may be arranged above the equipment-side rail. The sides of the support wall may have a first side and a second side. When the battery pack is attached to the electric device, the second side surface may be located farther from the device-side rail than the first side surface in the left-right direction. With respect to the front-rear direction, the upper fillet portion may connect the second side surface of the support wall and the lower surface of the flange near the rear end portion of the flange, and the lower fillet portion may connect the lower surface of the flange with the second side surface of the support wall. The second side surface of the support wall and the top surface of the support base may be connected.

Since a large load is likely to act near the rear end of the flange, stress tends to concentrate at the joints between the flange and the support wall and the joints between the support wall and the support base near the rear end of the flange. . In the above configuration, in the vicinity of the rear end of the flange, the upper fillet portion of the connecting portion between the support wall and the flange connects the second side surface of the support wall and the lower surface of the flange. Since the second side surface of the support wall is arranged inside the first side surface (the side farther from the device-side rail when the battery pack is attached to the electrical device) than the first side surface, the upper fillet portion is located on the first side surface of the support wall. The radius of curvature of the upper fillet portion can be increased compared to the case where the lower surface of the flange is connected to the upper fillet portion. Similarly, in the above configuration, in the vicinity of the rear end of the flange, the lower fillet portion of the connecting portion between the support wall and the support base connects the second side surface of the support wall and the upper surface of the support base. The radius of curvature of the lower fillet portion can be made larger than when the side fillet portion connects the first side surface of the support wall and the upper surface of the support base. Therefore, according to the above configuration, the radius of curvature of the upper fillet portion and the lower fillet portion can be increased in the vicinity of the rear end portion of the flange, and the stress concentrates on the upper fillet portion and the lower fillet portion. can be suppressed.

Fig. 2 is a perspective view of a state in which the battery pack 2 according to the first embodiment is attached to the electric device 4, as viewed from the front upper right side; Fig. 2 is a perspective view of the battery pack attachment portion 6 of the electric device 4 to which the battery pack 2 according to the first embodiment is attached, viewed from the front lower left side; 2 is a vertical cross-sectional view of a battery pack 2 according to Example 1. FIG. Fig. 2 is a perspective view of the battery pack 2 according to the first embodiment as seen from the rear upper right side; 4 is a right side view of the battery-side rail 40 of the battery pack 2 according to Embodiment 1. FIG. FIG. 6 is a sectional view of section VI-VI in FIG. 5 viewed from above; FIG. 6 is a cross-sectional view of section VII-VII of FIG. 5 viewed from the front; FIG. 6 is a sectional view of section VIII-VIII in FIG. 5 viewed from the front; FIG. 7 is a cross-sectional view of a state in which the battery pack 2 according to the first embodiment is attached to the electric device 4, viewed in a cross section corresponding to FIG. 6; FIG. 8 is a cross-sectional view of the state in which the battery pack 2 according to the first embodiment is attached to the electric device 4, viewed in a cross section corresponding to FIG. 7; FIG. 9 is a cross-sectional view of a state in which the battery pack 2 according to the first embodiment is attached to the electric device 4, viewed in a cross section corresponding to FIG. 8; FIG. 11 is a perspective view of the battery-side rail 40 of the battery pack 102 according to the second embodiment as seen from the rear upper right side; FIG. 12 is a side view of the battery-side rail 40 of the battery pack 102 according to the second embodiment as viewed from the right; FIG. 14 is a cross-sectional view of cross-section XIV-XIV in FIG. 13 viewed from above; FIG. 14 is a cross-sectional view of cross-section XV-XV in FIG. 13 viewed from the front; FIG. 11 is a perspective view of a battery-side rail 40 of a battery pack 202 according to Embodiment 3 as seen from the rear upper right side; FIG. 12 is a side view of the battery side rail 40 of the battery pack 202 according to the third embodiment, as viewed from the right; FIG. 18 is a sectional view of section XVIII-XVIII in FIG. 17 viewed from above; FIG. 18 is a front cross-sectional view of cross-section XIX-XIX in FIG. 17; FIG. 18 is a sectional view of the section XX-XX in FIG. 17 viewed from the front; FIG. 11 is a side view of a battery-side rail 40 of a battery pack 202 according to a modification of the third embodiment, viewed from the right;

A representative and non-limiting embodiment of the invention is described in detail below with reference to the drawings. This detailed description is merely intended to provide those skilled in the art with details for implementing a preferred embodiment of the invention, and is not intended to limit the scope of the invention. Also, the additional features and inventions disclosed can be used separately or in conjunction with other features and inventions to provide still improved battery packs.

Moreover, any combination of features and steps disclosed in the following detailed description are not required to practice the invention in its broadest sense, but are specifically intended to illustrate representative embodiments of the invention only. is described. Moreover, various features of the representative embodiments below, as well as those that are claimed, are described herein in providing additional and useful embodiments of the invention. They do not have to be combined in the exact order of the examples or in the order listed.

All features set forth in the specification and/or claims, apart from the configuration of the features set forth in the examples and/or claims, are set forth in the disclosure and claims as originally filed. They are intended to be disclosed individually and independently of each other as limitations on the particulars identified. Further, all numerical ranges and groups or populations are intended to disclose intermediate configurations as limitations on the specific subject matter recited in the original disclosure as well as the claims.

In one or more embodiments, the battery pack may be attachable to the electrical device by sliding it backwards and may be removable by sliding it forwards. good. The electric device may include a device-side rail extending in the front-rear direction. The battery pack may include a battery-side rail extending in the front-rear direction. The battery-side rail includes a support base, a support wall projecting upward from the support base, a flange projecting sideways from an upper end of the support wall, and connecting the side surface of the support wall and the lower surface of the flange. and a lower fillet portion connecting the side surface of the support wall and the upper surface of the support base. When the battery pack is attached to the electrical device, the upper surface of the support base may be arranged below the device-side rail, and the side surface of the support wall may be arranged laterally of the device-side rail. Alternatively, the lower surface of the flange may be arranged above the equipment-side rail. The sides of the support wall may have a first side and a second side. When the battery pack is attached to the electric device, the second side surface may be located farther from the device-side rail than the first side surface in the left-right direction. With respect to the front-rear direction, the upper fillet portion may connect the second side surface of the support wall and the lower surface of the flange near the rear end portion of the flange, and the lower fillet portion may connect the lower surface of the flange with the second side surface of the support wall. The second side surface of the support wall and the top surface of the support base may be connected.

Since a large load is likely to act near the rear end of the flange, stress tends to concentrate at the joints between the flange and the support wall and the joints between the support wall and the support base near the rear end of the flange. . In the above configuration, in the vicinity of the rear end of the flange, the upper fillet portion of the connecting portion between the support wall and the flange connects the second side surface of the support wall and the lower surface of the flange. Since the second side surface of the support wall is arranged inside the first side surface (the side farther from the device-side rail when the battery pack is attached to the electrical device) than the first side surface, the upper fillet portion is located on the first side surface of the support wall. The radius of curvature of the upper fillet portion can be increased compared to the case where the lower surface of the flange is connected to the upper fillet portion. Similarly, in the above configuration, in the vicinity of the rear end of the flange, the lower fillet portion of the connecting portion between the support wall and the support base connects the second side surface of the support wall and the upper surface of the support base. The radius of curvature of the lower fillet portion can be made larger than when the side fillet portion connects the first side surface of the support wall and the upper surface of the support base. Therefore, according to the above configuration, the radius of curvature of the upper fillet portion and the lower fillet portion can be increased in the vicinity of the rear end portion of the flange, and the stress concentrates on the upper fillet portion and the lower fillet portion. can be suppressed.

In one or more embodiments, the flange has a columnar portion in which the distance from the upper surface of the support base to the lower surface of the flange is constant in the front-rear direction, and is arranged behind the columnar portion. A tapered portion may be provided in which the distance from the upper surface of the support base to the lower surface of the flange increases from the front to the rear. With respect to the front-rear direction, the upper fillet portion may connect the second side surface of the support wall and the lower surface of the flange near a portion where the columnar portion is switched to the tapered portion. A fillet portion may connect the second side surface of the support wall and the top surface of the support base.

When the flange has a columnar portion and a tapered portion, a large load is likely to act on the flange near the point where the columnar portion is switched to the tapered portion. stress is likely to concentrate at the connection point. According to the above configuration, it is possible to increase the radius of curvature of the upper fillet portion and the lower fillet portion in the vicinity of the portion where the columnar portion is switched to the tapered portion. It is possible to suppress the concentration of stress on the connecting portion of the base.

In one or more embodiments, the support wall may extend rearwardly beyond the rearward end of the flange. The first side surface may be arranged at a portion rearward of the rear end portion of the flange of the support wall.

When attaching the battery pack to the electrical device, the first side surface of the support wall is brought into frictional contact with the side surface of the device-side rail, thereby positioning the battery pack in the left-right direction with respect to the electrical device. For this reason, if many second side surfaces are arranged on the support wall where the flange is provided, stress concentration at the connection point between the support wall and the flange and the connection point between the support wall and the support base can be suppressed, but the battery It becomes difficult to position the pack in the left-right direction with respect to the electrical equipment. According to the above configuration, since the first side surface is arranged behind the rear end of the flange of the support wall, a large number of second side surfaces are arranged on the support wall where the flange is provided. Even in this case, the battery pack can be reliably positioned in the left-right direction with respect to the electric device.

In one or more embodiments, the support wall has a recess having a shape recessed from the first side to the second side, and is positioned inside the recess to A rib having a shape protruding to the first side surface may be provided.

According to the above configuration, the supporting wall can be provided with the first side surface and the second side surface with a simple configuration.

In one or more embodiments, in the vicinity of the rib in the front-rear direction, the recess may not extend below the lower end of the rib, and the recess may not extend below the upper end of the rib. The recess may also extend upward.

In the above configuration, since the recess extends above the rib, the upper fillet portion connects the second side surface of the support wall and the lower surface of the flange in the vicinity of the rib. Therefore, in the vicinity of the rib, the radius of curvature of the upper fillet portion can be increased, and stress concentration at the connecting portion between the support wall and the flange can be suppressed. Further, in the above configuration, since the recess does not extend below the rib, it is possible to suppress the lower end portion of the rib from being worn due to uneven contact with the device-side rail.

In one or more embodiments, in the vicinity of the rib in the front-rear direction, the recess may not extend below the lower end of the rib, and the recess may not extend below the upper end of the rib. The recess may not extend upward.

According to the above configuration, since the recesses do not extend above or below the ribs, the upper and lower ends of the ribs do not come into contact with the equipment-side rails and wear out. can be suppressed.

(Example 1)
As shown in FIG. 1, the battery pack 2 of this embodiment is attached to an electric device 4 and used. The electric device 4 may be, for example, an electric power tool such as a screwdriver or a drill, or an electric working machine such as a mower or a blower. The electrical equipment 4 operates using power supplied from the battery pack 2 . The electrical device 4 has a battery pack attachment portion 6 . The battery pack 2 can be attached to the battery pack attachment portion 6 by sliding it in a predetermined sliding direction with respect to the battery pack attachment portion 6 . Hereinafter, the direction in which the battery pack 2 is slid when attached to the electric device 4 is called the rearward direction, and the direction in which the battery pack 2 is slid when the battery pack 2 is removed from the electric device 4 is called the forward direction. Further, when the battery pack 2 is attached to the electric device 4, the direction in which the electric device 4 is positioned as viewed from the battery pack 2 is called the upward direction, and the opposite direction to the upward direction is called the downward direction. Further, a direction orthogonal to the front-rear direction and the up-down direction is referred to as the left-right direction.

As shown in FIG. 2 , device-side terminals 8 and device-side rails 10 are provided on the battery pack attachment portion 6 of the electrical device 4 . The device-side terminals 8 mechanically engage and electrically connect with the battery-side terminals 26 (see FIG. 3) of the battery pack 2 when the battery pack 2 is attached to the battery pack attachment portion 6 . The device-side rail 10 extends in the front-rear direction on the left and right sides of the device-side terminal 8 . In the following description, regarding the device-side rail 10 arranged on the left side of the device-side terminal 8, the left side is called the outside and the right side is called the inside. Regarding the rail 10, the right side is called the outside and the left side is called the inside. The device-side rail 10 is formed at the lower end of the housing 12 of the electrical device 4 . The device-side rail 10 extends upward from a lower surface 10a extending in the front-rear direction and the left-right direction, and an inner end of the lower surface 10a. It has an upper surface 10c that extends outward and extends in the front-rear direction and the left-right direction, and a convex portion 10d that protrudes upward from the rear portion of the upper surface 10c. The convex portion 10d extends along the left-right direction.

As shown in FIG. 3 , the battery pack 2 includes battery cells 20 , cell holders 22 that hold the battery cells 20 , and cell holders 22 that are held above the cell holders 22 and electrically connected to the battery cells 20 . It includes a control board 24 , battery-side terminals 26 provided on the control board 24 , and a casing 28 that accommodates the battery cells 20 , cell holders 22 , control board 24 and battery-side terminals 26 . Casing 28 includes a lower casing 30 and an upper casing 32 . A hook 34 is attached to the upper casing 32 . The hook 34 has an engaging portion 34a and an operating portion 34b. Hook 34 is biased upward by spring 36 . When the battery pack 2 is attached to the electric device 4, the engaging portion 34a of the hook 34 is inserted into the engaging groove 12a (see FIG. 2) formed in the housing 12 of the electric device 4, so that the battery pack 2 is attached. It is fixed to the electrical equipment 4 . When the operating portion 34b of the hook 34 is pushed down from this state, the engaging portion 34a is pulled out of the engaging groove 12a. In this state, the battery pack 2 can be slid with respect to the electric device 4 and the battery pack 2 can be removed from the electric device 4 .

As shown in FIG. 4 , terminal openings 38 and battery side rails 40 are formed in the upper casing 32 of the battery pack 2 . The terminal openings 38 are arranged at positions corresponding to the battery-side terminals 26 (see FIG. 3). When attaching the battery pack 2 to the electric device 4 , the device-side terminals 8 (see FIG. 2 ) of the electric device 4 enter the upper casing 32 through the terminal openings 38 . As a result, the device-side terminals 8 are mechanically engaged with the battery-side terminals 26 and electrically connected.

The battery-side rails 40 extend in the front-rear direction on the left and right sides of the terminal opening 38 . In the following description, regarding the battery side rail 40 arranged on the left side of the terminal opening 38, the left side is called the outside, the right side is called the inside, and the battery side rail 40 arranged on the right side of the terminal opening 38 is used. Regarding the rail 40, the right side is called the outside and the left side is called the inside. The battery-side rail 40 includes a support base 46 formed on the upper casing 32 , a support wall 42 projecting upward from the support base 46 , and a flange 44 projecting outward from the upper end of the support wall 42 . I have. A depression 42 a having a flat bottom is formed on the outer side surface of the support wall 42 . A portion of the outer side surface of the support wall 42 where the depression 42a is not formed is also referred to as a first side surface 42b, and the bottom surface of the depression 42a is also referred to as a second side surface 42c. The first side surface 42b extends in the front-rear direction and the left-right direction. The second side surface 42c extends in the front-rear direction and the left-right direction. As shown in FIG. 6, the second side surface 42c is arranged inside the first side surface 42b.

As shown in FIG. 5, the flange 44 includes a columnar portion 48, a first tapered portion 50, and a second tapered portion 52. As shown in FIG. The columnar portion 48 has a longitudinal direction in the front-rear direction. The columnar portion 48 has an upper surface 48a, an inclined surface 48b, a side surface 48c, and a lower surface 48d. The upper surface 48a extends in the front-rear direction and the left-right direction. The side surface 48c extends along the front-back direction and the up-down direction. The inclined surface 48b connects the outer edge of the upper surface 48a and the upper edge of the side surface 48c. 48 d of lower surfaces are extended along the front-back direction and the left-right direction. The outer edge of the lower surface 48d connects to the lower edge of the side surface 48c. The vertical distance from the upper surface 46a of the support base 46 to the lower surface 48d of the columnar portion 48 is substantially constant. Further, the horizontal distance from the first side surface 42b (or the second side surface 42c) of the support wall 42 to the side surface 48c of the columnar portion 48 is substantially constant.

The first tapered portion 50 is arranged behind the columnar portion 48 . The first tapered portion 50 has an upper surface 50a, an inclined surface 50b, a side surface 50c, and a lower surface 50d. The upper surface 50a is continuous from the upper surface 48a of the columnar portion 48 and extends along the front-rear direction and the left-right direction. The side surface 50c is continuous with the side surface 48c of the columnar portion 48 and extends in the front-rear direction and the vertical direction. The inclined surface 50b continues from the inclined surface 48b of the columnar portion 48 and connects the outer edge of the upper surface 50a and the upper edge of the side surface 50c. The lower surface 50d is continuous with the lower surface 48d of the columnar portion 48 and is curved upward from the front as it goes from the front to the rear. The vertical distance from the upper surface 46a of the support base 46 to the lower surface 50d of the first tapered portion 50 increases from the front to the rear. Further, the horizontal distance from the first side surface 42b (or the second side surface 42c) of the support wall 42 to the side surface 50c of the first taper portion 50 is substantially constant.

The second tapered portion 52 is arranged behind the first tapered portion 50 . The second tapered portion 52 has an upper surface 52a, an inclined surface 52b, and a lower surface 52c. The upper surface 52a is continuous from the upper surface 50a of the first tapered portion 50 and extends along the front-rear direction and the left-right direction. The lower surface 52c is continuous with the lower surface 50d of the first tapered portion 50 and extends in the front-rear direction and the left-right direction. The inclined surface 52b is continuous with the inclined surface 50b and the side surface 50c of the first tapered portion 50, and is inclined from the outside toward the inside from the front toward the rear. The upper end of the inclined surface 52b is connected to the upper surface 52a, and the lower end of the inclined surface 52b is connected to the lower surface 52c. The vertical distance from the upper surface 46a of the support base 46 to the lower surface 52c of the second tapered portion 52 is substantially constant. In addition, the horizontal distance from the first side surface 42b (or the second side surface 42c) of the support wall 42 to the inclined surface 52b of the second tapered portion 52 decreases from the front to the rear.

The recess 42 a of the support wall 42 is arranged below the flange 44 near the rear end thereof. Specifically, the depression 42 a of the support wall 42 is arranged below the rear end portion of the columnar portion 48 , below the first taper portion 50 , and below the second taper portion 52 .

As shown in FIG. 7, an upper fillet portion 42d is formed at a connecting portion between the lower surface 48d of the columnar portion 48 and the first side surface 42b of the support wall 42. As shown in FIG. A lower fillet portion 42e is formed at the connecting portion between the upper surface 46a of the support base 46 and the first side surface 42b of the support wall 42. As shown in FIG. A curvature radius R of the upper fillet portion 42d and the lower fillet portion 42e is, for example, about 0.7 mm.

As shown in FIG. 8, at the connection point between the lower surface 48d of the columnar portion 48 (or the lower surface 50d of the first tapered portion 50 or the lower surface 52c of the second tapered portion 52) and the second side surface 42c of the support wall 42, an upper side surface 42c is provided. A fillet portion 42f is formed. A lower fillet portion 42g is formed at a connecting portion between the upper surface 46a of the support base 46 and the second side surface 42c of the support wall 42. As shown in FIG. The curvature radius R of the upper fillet portion 42f and the lower fillet portion 42g is, for example, about 1.5 mm.

When attaching the battery pack 2 to the electric device 4, the front end portion of the device-side rail 10 shown in FIG. . After that, the front end of the device-side rail 10 passes between the upper surface 46a of the support base 46 and the lower surface 50d of the first tapered portion 50, and passes between the upper surface 46a of the support base 46 and the lower surface 48d of the columnar portion 48. do. After that, the second tapered portion 52 of the battery-side rail 40 rides on the convex portion 10d (see FIG. 2) of the device-side rail 10, and the engaging portion 34a of the hook 34 engages with the engaging groove 12a (see FIG. 2) of the electrical device 4. ), the battery pack 2 is positioned in the front-rear direction with respect to the electric device 4 .

As shown in FIGS. 9 and 10, when the battery pack 2 is attached to the electrical device 4, the first side surface 42b of the support wall 42 of the battery-side rail 40 and the side surface 10b of the device-side rail 10 have a small gap. are placed facing each other via Thereby, the battery pack 2 is positioned in the left-right direction with respect to the electric device 4 .

As shown in FIGS. 10 and 11, when the battery pack 2 is attached to the electric device 4, the upper surface 46a of the support base 46 faces the lower surface 10a of the device-side rail 10 with a slight gap therebetween. At the same time, the lower surface 48d of the columnar portion 48 of the battery-side rail 40 is arranged to face the upper surface 10c of the device-side rail 10 with a slight gap therebetween. Thereby, the battery pack 2 is vertically positioned with respect to the electric device 4 .

When a load or vibration is transmitted between the battery pack 2 and the electric device 4, stress concentration occurs at the connecting portion between the support wall 42 and the flange 44. FIG. In particular, in the vicinity of the rear end portion of the flange 44, a large stress concentration occurs at the connecting portion between the support wall 42 and the flange 44. As shown in FIG. In particular, at the point where the columnar portion 48 is switched to the first taper portion 50 , a very large stress concentration occurs at the connecting portion between the support wall 42 and the flange 44 . However, in the battery pack 2 of this embodiment, the recess 42a is formed in the support wall 42 in the vicinity of the rear end of the flange 44, so the curvature radius R of the upper fillet portion 42f can be increased. As a result, it is possible to suppress the occurrence of large stress concentration at the connection portion between the support wall 42 and the flange 44 at the rear end portion of the flange 44, particularly at the portion where the columnar portion 48 is switched to the first tapered portion 50. Damage to the joint between the support wall 42 and the flange 44 can be suppressed.

However, if the occurrence of a large stress concentration at the connection point between the support wall 42 and the flange 44 is suppressed, then stress concentration occurs at the connection point between the support wall 42 and the support base 46 . In particular, in the vicinity of the rear end portion of the flange 44, a large stress concentration occurs at the connecting portion between the support wall 42 and the support base 46. As shown in FIG. However, in the battery pack 2 of this embodiment, the recess 42a is formed in the support wall 42 in the vicinity of the rear end of the flange 44, so that the radius of curvature R of the lower fillet portion 42g can be increased. . As a result, in the vicinity of the rear end of the flange 44, it is possible to suppress the occurrence of large stress concentration at the connection point between the support wall 42 and the support base 46, and the connection point between the support wall 42 and the support base 46 is damaged. can be suppressed.

(Example 2)
FIG. 12 shows the battery pack 102 of this embodiment. A battery pack 102 of this embodiment has substantially the same configuration as the battery pack 2 of the first embodiment. In the following, the battery pack 102 of this embodiment will be described mainly regarding the configuration that is different from the battery pack 2 of the first embodiment.

As shown in FIGS. 13 and 14 , in battery pack 102 , depression 42 a of support wall 42 is formed from below the front end of flange 44 to below the rear end. Therefore, the lower surface 48 d of the columnar portion 48 of the flange 44 , the lower surface 50 d of the first tapered portion 50 , and the lower surface 52 c of the second tapered portion 52 are all connected to the second side surface 42 c of the support wall 42 . . A recess 42a is not formed in the support wall 42 behind the rear end of the flange 44. As shown in FIG. Therefore, the first side surface 42 b of the support wall 42 is arranged rearward of the rear end of the flange 44 .

As shown in FIG. 15, at the connection point between the lower surface 48d of the columnar portion 48 (or the lower surface 50d of the first tapered portion 50 or the lower surface 52c of the second tapered portion 52) and the second side surface 42c of the support wall 42, an upper side surface 42c is provided. A fillet portion 42f is formed. A lower fillet portion 42g is formed at a connecting portion between the upper surface 46a of the support base 46 and the second side surface 42c of the support wall 42. As shown in FIG. The curvature radius R of the upper fillet portion 42f and the lower fillet portion 42g is, for example, about 1.5 mm.

When the battery pack 102 of this embodiment is attached to the electric device 4, the first side surface 42b of the support wall 42 of the battery-side rail 40 faces the side surface 10b of the device-side rail 10 with a small gap. placed. Thereby, the battery pack 102 is positioned in the left-right direction with respect to the electric device 4 . Further, when the battery pack 102 of the present embodiment is attached to the electric device 4, the upper surface 46a of the support base 46 is arranged to face the lower surface 10a of the device-side rail 10 with a slight gap therebetween. A lower surface 48d of the columnar portion 48 of the battery-side rail 40 is arranged to face the upper surface 10c of the device-side rail 10 with a slight gap therebetween. Thereby, the battery pack 102 is vertically positioned with respect to the electric device 4 .

In the battery pack 102 of the present embodiment, a depression 42a is formed in the support wall 42 from the front end to the rear end of the flange 44 . Therefore, the radius of curvature R of the upper fillet portion 42f at the connecting portion between the support wall 42 and the flange 44 can be increased. As a result, it is possible to suppress the occurrence of a large concentration of stress at the joint between the support wall 42 and the flange 44, and to suppress the breakage of the joint between the support wall 42 and the flange 44.

Further, in the battery pack 102 of the present embodiment, a recess 42a is formed in the support wall 42 from the front end to the rear end of the flange 44 . Therefore, the radius of curvature R of the lower fillet portion 42g at the connecting portion between the support wall 42 and the support base 46 can be increased from the front end portion to the rear end portion of the flange 44 . As a result, it is possible to suppress the occurrence of a large stress concentration at the connection point between the support wall 42 and the support base 46 , and it is possible to suppress the damage to the connection point between the support wall 42 and the support base 46 .

(Example 3)
FIG. 16 shows the battery pack 202 of this embodiment. A battery pack 202 of this embodiment has substantially the same configuration as the battery pack 2 of the first embodiment. In the following, the battery pack 202 of this embodiment will be described mainly regarding the configuration that is different from the battery pack 2 of the first embodiment.

As shown in FIGS. 17 and 18 , in battery pack 202 , depression 42 a of support wall 42 is formed from below the front end of flange 44 to the rear end of support wall 42 . Therefore, the lower surface 48 d of the columnar portion 48 of the flange 44 , the lower surface 50 d of the first tapered portion 50 , and the lower surface 52 c of the second tapered portion 52 are all connected to the second side surface 42 c of the support wall 42 . . In addition, in the battery pack 202 of the present embodiment, the support wall 42 is formed with ribs 42h projecting outward from the bottom surface of the recess 42a. The rib 42 h is arranged below the columnar portion 48 of the flange 44 and below the rear end portion of the second taper portion 52 . Although the lower end of the rib 42 h reaches the support base 46 , the upper end of the rib 42 h does not reach the flange 44 . The rib 42h has a flat convex surface, and the convex surface constitutes the first side surface 42b.

As shown in FIG. 19, at the connection point between the lower surface 48d of the columnar portion 48 (or the lower surface 50d of the first tapered portion 50 or the lower surface 52c of the second tapered portion 52) and the second side surface 42c of the support wall 42, an upper side surface 42c is provided. A fillet portion 42f is formed. A lower fillet portion 42g is formed at a connecting portion between the upper surface 46a of the support base 46 and the second side surface 42c of the support wall 42. As shown in FIG. The curvature radius R of the upper fillet portion 42f and the lower fillet portion 42g is, for example, about 1.5 mm.

As shown in FIG. 20, a lower fillet portion 42e is formed at the connecting portion between the upper surface 46a of the support base 46 and the first side surface 42b of the support wall 42. As shown in FIG. The curvature radius R of the lower fillet portion 42e is, for example, about 0.7 mm.

When the battery pack 202 of this embodiment is attached to the electric device 4, the first side surface 42b of the support wall 42 of the battery-side rail 40 faces the side surface 10b of the device-side rail 10 with a slight gap. placed. Thereby, the battery pack 202 is positioned in the left-right direction with respect to the electric device 4 . Further, when the battery pack 202 of the present embodiment is attached to the electric device 4, the upper surface 46a of the support base 46 is arranged to face the lower surface 10a of the device-side rail 10 with a slight gap therebetween. A lower surface 48d of the columnar portion 48 of the battery-side rail 40 is arranged to face the upper surface 10c of the device-side rail 10 with a slight gap therebetween. Thereby, the battery pack 202 is vertically positioned with respect to the electric device 4 .

In the battery pack 202 of this embodiment, a recess 42 a is formed in the support wall 42 from the front end of the flange 44 to the rear end of the support wall 42 . Therefore, the radius of curvature R of the upper fillet portion 42f at the connecting portion between the support wall 42 and the flange 44 can be increased. As a result, it is possible to suppress the occurrence of a large concentration of stress at the joint between the support wall 42 and the flange 44, and to suppress the breakage of the joint between the support wall 42 and the flange 44.

In addition, in the battery pack 202 of the present embodiment, the depression 42a is formed in the support wall 42 from the front end to the rear end of the flange 44. The rib 42h is not formed in the taper part 50. As shown in FIG. Therefore, the radius of curvature R of the lower fillet portion 42g at the connecting portion between the support wall 42 and the support base 46 can be increased in the vicinity of the rear end portion of the columnar portion 48 and in the first tapered portion 50 . As a result, it is possible to suppress the occurrence of a large concentration of stress in the vicinity of the rear end portion of the columnar portion 48 and in the connection portion between the support wall 42 and the support base 46 in the first tapered portion 50 . It is possible to suppress damage to the connecting portion of the support base 46 .

In battery pack 202 , the lower end of rib 42 h reaches support base 46 . Therefore, when attaching the battery pack 202 to the electric device 4, it is possible to prevent the lower end portion of the rib 42h from coming into contact with the device-side rail 10 and being worn.

As shown in FIG. 21 , in the battery pack 202 of this embodiment, the lower end of the rib 42 h reaches the support base 46 and the upper end of the rib 42 h reaches the flange 44 . , a rib 42h may be formed. According to the configuration shown in FIG. 21, when the battery pack 202 is attached to the electric device 4, the upper end portion and the lower end portion of the rib 42h are prevented from coming into contact with the device-side rail 10 and being worn. be able to.

As described above, in one or more embodiments, the battery pack 2, 102, 202 can be attached to the electrical device 4 by sliding it backwards and sliding it forwards. It can be removed by The electric device 4 includes a device-side rail 10 extending in the front-rear direction. The battery packs 2, 102, 202 are provided with battery-side rails 40 extending in the front-rear direction. The battery-side rail 40 includes a support base 46, a support wall 42 projecting upward from the support base 46, a flange 44 projecting laterally from the upper end of the support wall 42, and a first side surface 42b of the support wall 42 or An upper fillet portion that connects the second side surface 42c (example of the side surface of the support wall) and the lower surface 48d of the columnar portion 48, the lower surface 50d of the first tapered portion 50, or the lower surface 52c of the second tapered portion 52 (example of the lower surface of the flange) 42d, 42f, and lower fillet portions 42e, 42g connecting the first side surface 42b or the second side surface 42c of the support wall 42 and the upper surface 46a of the support base 46. As shown in FIG. When the battery pack 2, 102, 202 is attached to the electric equipment 4, the upper surface 46a of the support base 46 is arranged below the equipment-side rail 10, and the first side surface 42b or the second side surface 42c of the support wall 42 The lower surface 48 d of the columnar portion 48 , the lower surface 50 d of the first tapered portion 50 , or the lower surface 52 c of the second tapered portion 52 are arranged on the side of the side rail 10 above the device side rail 10 . When the battery pack 2, 102, 202 is attached to the electric device 4, the second side surface 42c is arranged at a position farther from the device-side rail 10 than the first side surface 42b in the left-right direction. With respect to the front-rear direction, near the rear end of the flange 44, the upper fillet portion 42f is formed between the second side surface 42c of the support wall 42 and the lower surface 48d of the columnar portion 48, the lower surface 50d of the first tapered portion 50, or the second tapered portion 52. The lower fillet portion 42g connects the second side surface 42c of the support wall 42 and the upper surface 46a of the support base 46. As shown in FIG.

Since a large load is likely to act on the vicinity of the rear end of the flange 44 , the joints between the flange 44 and the support wall 42 and the joints between the support wall 42 and the support base 46 are not affected in the vicinity of the rear end of the flange 44 . , stress is likely to concentrate. In the above configuration, in the vicinity of the rear end of the flange 44, the upper fillet portion 42f at the connection point between the support wall 42 and the flange 44 is the second side surface 42c of the support wall 42, the lower surface 48d of the columnar portion 48, and the first taper. The lower surface 50d of the portion 50 or the lower surface 52c of the second tapered portion 52 is connected. Since the second side surface 42c of the support wall 42 is arranged inside the first side surface 42b (the side farther from the device-side rail 10 when the battery pack 2, 102, 202 is attached to the electric device 4), The radius of curvature of the upper fillet portion 42f can be increased. Similarly, in the above configuration, in the vicinity of the rear end portion of the flange 44, the lower fillet portion 42g of the connecting portion between the support wall 42 and the support base 46 is located between the second side surface 42c of the support wall 42 and the upper surface of the support base 46. 46a, and the radius of curvature of the lower fillet portion 42g can be increased. Therefore, according to the above configuration, the radius of curvature of the upper fillet portion 42f and the lower fillet portion 42g can be increased in the vicinity of the rear end portion of the flange 44, and the upper fillet portion 42f and the lower fillet portion 42g can be curved. It is possible to suppress the stress from concentrating on

In one or more embodiments, flange 44 includes a post 48 and a first taper 50 (an example of a taper) positioned rearwardly of post 48 . In the columnar portion 48, the distance from the upper surface 46a of the support base 46 to the lower surface 48d of the columnar portion 48 is constant in the front-rear direction. In the first tapered portion 50, the distance from the upper surface 46a of the support base 46 to the lower surface 50d of the first tapered portion 50 increases from the front to the rear. With respect to the front-rear direction, the upper fillet portion 42f is formed between the second side surface 42c of the support wall 42 and the lower surface 48d of the columnar portion 48 or the lower surface of the first tapered portion 50 in the vicinity of the portion where the columnar portion 48 is switched to the first tapered portion 50. 50 d , and the lower fillet portion 42 g connects the second side surface 42 c of the support wall 42 and the upper surface 46 a of the support base 46 .

When the flange 44 has the columnar portion 48 and the first tapered portion 50, a large load is likely to act on the flange 44 in the vicinity of the point where the columnar portion 48 is switched to the first tapered portion 50. Stress is likely to concentrate on the connecting portion of the wall 42 and the connecting portion of the support wall 42 and the support base 46 . According to the above configuration, it is possible to increase the radius of curvature of the upper fillet portion 42f and the lower fillet portion 42g in the vicinity of the portion where the columnar portion 48 is switched to the first taper portion 50, and the support wall 42 and the flange 44 It is possible to suppress the concentration of stress at the connection point between the support wall 42 and the support base 46 .

In one or more embodiments, support wall 42 extends rearwardly beyond the rearward end of flange 44 . The first side surface 42 b is arranged at a portion rearward of the rear end portion of the flange 44 of the support wall 42 .

When attaching the battery pack 2 , 102 , 202 to the electrical equipment 4 , the first side surface 42 b of the support wall 42 is brought into frictional contact with the side surface 10 b of the equipment-side rail 10 , so that the battery pack 2 , 102 , 202 is attached to the electrical equipment 4 . positioned in the left-right direction with respect to the Therefore, if many second side surfaces 42c are arranged on the support wall 42 where the flange 44 is provided, the stress concentration at the connection point between the support wall 42 and the flange 44 and the connection point between the support wall 42 and the support base 46 is suppressed. Although it can be done, it becomes difficult to position the battery packs 2 , 102 , 202 in the left-right direction with respect to the electric device 4 . According to the above configuration, since the first side surface 42b is arranged in the portion behind the rear end of the flange 44 of the support wall 42, the support wall 42 where the flange 44 is provided has the second side surface 42b. Battery packs 2, 102, and 202 can be reliably positioned in the left-right direction with respect to electric device 4 even when many side surfaces 42c are arranged.

In one or more embodiments, support wall 42 has recess 42a having a shape that is recessed from first side 42b to second side 42c, and is positioned within recess 42a and extends from second side 42c. A rib 42h having a shape projecting to the first side surface 42b is provided.

According to the above configuration, the support wall 42 can be provided with the first side surface 42b and the second side surface 42c with a simple configuration.

In one or more embodiments, in the fore-and-aft direction, in the vicinity of the rib 42h, the recess 42a does not extend below the lower end of the rib 42h and above the upper end of the rib 42h. A recess 42a extends in the .

In the above configuration, since the depression 42a extends above the rib 42h, in the vicinity of the rib 42h, the upper fillet portion 42f is formed between the second side surface 42c of the support wall 42 and the lower surface 48d of the columnar portion 48 or the second second side surface 42c. The bottom surface 52c of the tapered portion 52 is connected. Therefore, in the vicinity of the rib 42h, the radius of curvature of the upper fillet portion 42f can be increased, and stress concentration at the connecting portion between the support wall 42 and the flange 44 can be suppressed. Further, in the above configuration, since the recess does not extend below the rib 42h, it is possible to prevent the lower end of the rib 42h from coming into uneven contact with the device-side rail 10 and being worn.

In one or more embodiments, in the fore-and-aft direction, in the vicinity of the rib 42h, the recess 42a does not extend below the lower end of the rib 42h, and above the upper end of the rib 42h. Recess 42a does not extend.

According to the above configuration, since the depression 42a does not extend above or below the rib 42h, the upper end or lower end of the rib 42h is in one-sided contact with the device-side rail 10. and wear can be suppressed.

2 : Battery pack 4 : Electric device 6 : Battery pack mounting part 8 : Device side terminal 10 : Device side rail 10a: Bottom surface 10b: Side surface 10c: Top surface 10d: Projection 12: Housing 12a: Engagement groove 20: Battery cell 22 : Cell holder 24 : Control board 26 : Battery side terminal 28 : Casing 30 : Lower casing 32 : Upper casing 34 : Hook 34a: Engagement portion 34b: Operation portion 36 : Spring 38 : Terminal opening 40 : Battery side rail 42 : Support wall 42a: recess 42b: first side surface 42c: second side surface 42d: fillet portion 42e: fillet portion 42f: fillet portion 42g: fillet portion 42h: rib 44: flange 46: support base 46a: upper surface 48: columnar portion 48a: Upper surface 48b: Inclined surface 48c: Side surface 48d: Lower surface 50: First tapered portion 50a: Upper surface 50b: Inclined surface 50c: Side surface 50d: Lower surface 52: Second tapered portion 52a: Upper surface 52b: Inclined surface 52c: Lower surface 102: Battery pack 202: battery pack

Claims (6)

a battery pack,
It can be attached to an electric device by sliding it backward, and it can be removed by sliding it forward,
The electric device includes a device-side rail extending in the front-rear direction,
The battery pack includes a battery-side rail extending in the front-rear direction,
The battery-side rail is
a support base;
a support wall protruding upward from the support base;
a flange projecting laterally from an upper end of the support wall;
an upper fillet portion connecting the side surface of the support wall and the lower surface of the flange;
a lower fillet portion connecting the side surface of the support wall and the upper surface of the support base;
When the battery pack is attached to the electrical device, the upper surface of the support base is arranged below the device-side rail, the side surface of the support wall is arranged on the side of the device-side rail, and the flange is positioned on the side of the device-side rail. The lower surface is arranged above the device-side rail,
the sides of the support wall having a first side and a second side;
When the battery pack is attached to the electric device, the second side surface is arranged at a position farther from the device-side rail than the first side surface in the left-right direction, and
With respect to the front-rear direction, the upper fillet portion connects the second side surface of the support wall and the lower surface of the flange near the rear end portion of the flange, and the lower fillet portion connects the support wall. and the top surface of the support platform. The flange is
a columnar portion in which the distance from the upper surface of the support base to the lower surface of the flange is constant in the front-rear direction;
A tapered portion is provided behind the columnar portion, and the distance from the upper surface of the support base to the lower surface of the flange increases from the front to the rear,
With respect to the front-rear direction, the upper fillet portion connects the second side surface of the support wall and the lower surface of the flange in the vicinity of the portion where the columnar portion is switched to the tapered portion, and the lower fillet portion connects the second side surface of the support wall and the lower surface of the flange. connects the second side surface of the support wall and the top surface of the support platform. The support wall extends rearward from the rear end of the flange,
3. The battery pack according to claim 1, wherein said first side surface is arranged at a portion rearward of a rear end portion of said flange of said support wall. The support wall is
a recess having a recessed shape from the first side surface to the second side surface;
The battery pack according to any one of claims 1 to 3, further comprising a rib arranged inside said recess and having a shape projecting from said second side surface to said first side surface. With respect to the front-rear direction, in the vicinity of the rib, the recess does not extend below the lower end of the rib, and the recess extends above the upper end of the rib. The battery pack of claim 4. With respect to the longitudinal direction, in the vicinity of the rib, the recess does not extend below the lower end of the rib, and the recess does not extend above the upper end of the rib. Item 4 battery pack.

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