Patent Description:
With the intensive study of environmental issues, more power units are being driven by electric power instead of fuel.

The specification of the Chinese invention patent <CIT> discloses an electric power unit, which comprises a motor and a battery pack for supplying power to the motor, wherein the electric power unit can be mounted on various working machines in place of a fuel engine, and achieves miniaturization and versatility of the electric power unit to some extent.

As can be seen from the specification of the above patent and FIG. 5A, the battery pack in the patent is shaped as a cuboid and is mounted at the top of the motor through a frame. In practical application, the height of the electric power unit is higher than that of the common fuel engine on the market due to the shape of the battery pack. Therefore, how to reduce the overall height of the battery pack and meanwhile ensure the endurance of the battery pack under the condition of satisfying the overall size limitation of the fuel engine is a problem to be overcome in a case that the electric power unit replaces the fuel engine.

<CIT> is another known example and shows the preamble of claim <NUM>.

Other examples are known from <CIT>, <CIT>, <CIT>, <CIT>, <CIT> or <CIT>.

Aiming at the defects in the prior art, the present invention provides an electrically-driven power unit of a compact battery pack and a working machine, so that the overall height of the electrically-driven power unit is reduced on the premise of not reducing the endurance of the battery pack so as to satisfy the overall mounting size limitation.

In an aspect, the present invention provides an electrically-driven power unit of a compact battery pack, which comprises a motor and a battery pack, wherein the motor is mounted on a base, the battery pack is supported on an upper part of the motor through a supporting frame, the supporting frame is shaped around the periphery of the motor, an arch-shaped supporting portion matched with the upper part of the motor is formed on an upper part of the supporting frame, a concave portion matched with the arch-shaped supporting portion is arranged at a bottom of the battery pack, and the arch-shaped supporting portion of the supporting frame is supported in the concave portion of the battery pack.

Furthermore, a first mounting portion and a second mounting portion are respectively arranged on both sides of the arch-shaped supporting portion on the supporting frame, and areas of the bottom of the battery pack located on both sides of the concave portion are respectively supported on the first mounting portion and the second mounting portion.

Furthermore, cushion pads are arranged between the bottom of the battery pack and the arch-shaped supporting portion, the first mounting portion and the second mounting portion on the supporting frame.

Furthermore, a side part of the first mounting portion is vertically aligned with a side part on a same side of the supporting frame, and the second mounting portion is of a cantilever structure formed by extending the side part of the supporting frame outwards.

Furthermore, the battery pack comprises a box body and a battery set and a battery management system arranged in the box body, wherein an upper inclination angle of the box body on one side of the second mounting portion is set as a mounting space for the battery management system, and a rest part in the box body is set as a mounting space for the battery set.

Furthermore, supports are arranged on both sides of the motor on the base, lower parts of both sides of the supporting frame are respectively mounted on the supports on the corresponding sides through elastic vibration damping bodies, and the elastic vibration damping bodies on both sides are obliquely arranged, such that axes of the elastic vibration damping bodies on both sides intersect above;
a center of gravity of the battery pack is located in a lower area where the axes of the elastic vibration damping bodies on both sides intersect.

Furthermore, the battery set is supported in the box body through vibration damping blocks.

Furthermore, the battery set comprises a battery cell holder and a plurality of cylindrical battery cells longitudinally distributed on the battery cell holder in parallel, the cylindrical battery cells being distributed in a regular triangle shape. Furthermore, an output shaft of the motor is in a horizontal or vertical direction.

In another aspect, the present invention provides a working machine, which comprises the electrically-driven power unit of a compact battery pack described above.

The beneficial effects of the present invention are as follows:
The supporting frame of the present application is shaped around the periphery of the motor to form an arch-shaped supporting portion fitting on the upper part of the motor. Simultaneously, through the arrangement of the concave portion at the bottom of the battery pack, the battery pack is no longer a simple cuboid, but is designed into a special molding of fitting the arch-shaped supporting portion of the supporting frame, making full use of the space of the side part of the motor, and thus realizing the effective utilization in space. The battery pack structure is more compact, and the overall height of the electrically-driven power unit can be reduced on the premise of not reducing the endurance of the battery pack, so as to satisfy the overall mounting size limitation, which is beneficial to realizing the miniaturization of the electrically-driven power unit and further replacing the fuel engine.

In order to more clearly illustrate the technical schemes in the embodiments of the present invention or in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below. In all of the drawings, like elements or parts are generally identified by like reference numerals. In the drawings, elements or parts are not necessarily drawn to actual scale.

In the figures, <NUM> is motor; <NUM> is supporting frame; <NUM> is arch-shaped supporting portion; <NUM> is first mounting portion; <NUM> is second mounting portion; <NUM> is cushion pad; <NUM> is battery pack; <NUM> is concave portion; <NUM> is box body; <NUM> is lower box body; <NUM> is upper box body; <NUM> is vibration damping block; <NUM> is battery set; <NUM> is battery cell holder; <NUM> is cylindrical battery cell; <NUM>- is battery management system; <NUM> is center of gravity; <NUM> is base; <NUM> is support; <NUM> is elastic vibration damping body.

Examples of the technical schemes of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical schemes of the present invention more clearly, and therefore are only used as examples and cannot be used to limit the protection scope of the present invention.

It should be noted that the terms or words used in the present application should not be construed as being limited to general or dictionary meanings unless otherwise specified, but interpreted only as meanings and concepts conforming to the technical idea of the present invention on the basis of the principle that "the inventor appropriately defines the concept of the terms in order to describe his own invention in the best way".

As shown in <FIG>, Embodiment <NUM> provides an electrically-driven power unit of a compact battery pack, which comprises a motor <NUM> and a battery pack <NUM>, wherein
the motor <NUM> is mounted on a base <NUM>, an output shaft of the motor <NUM> is in a horizontal direction in this embodiment, and the base <NUM> may also be an object to be carried by the electrically-driven power unit.

The battery pack <NUM> is supported on an upper part of the motor <NUM> through a supporting frame <NUM>, the supporting frame <NUM> is shaped around the periphery of the motor <NUM>, an arch-shaped supporting portion <NUM> matched with the upper part of the motor <NUM> is formed on an upper part of the supporting frame <NUM>, a concave portion <NUM> matched with the arch-shaped supporting portion <NUM> is arranged at a bottom of the battery pack <NUM>, and the arch-shaped supporting portion <NUM> of the supporting frame <NUM> is supported in the concave portion <NUM> of the battery pack <NUM>.

The supporting frame <NUM> of the present application is shaped around the periphery of the motor <NUM> to form an arch-shaped supporting portion <NUM> fitting on the upper part of the motor <NUM>. Simultaneously, through the arrangement of the concave portion <NUM> at the bottom of the battery pack <NUM>, the battery pack <NUM> is no longer a simple cuboid, but is designed into a special molding of fitting the arch-shaped supporting portion <NUM> of the supporting frame <NUM>, making full use of the space of the side part of the motor <NUM>, and thus realizing the effective utilization in space. The battery pack structure is more compact, the overall height of the electrically-driven power unit can be reduced on the premise of not reducing the endurance of the battery pack <NUM>, which is beneficial to realizing the miniaturization of the electrically-driven power unit and further replacing the fuel engine.

In this embodiment, referring to <FIG>, a first mounting portion <NUM> and a second mounting portion <NUM> are respectively arranged on both sides of the arch-shaped supporting portion <NUM> on the supporting frame <NUM>, and areas of the bottom of the battery pack <NUM> located on both sides of the concave portion <NUM> are respectively supported on the first mounting portion <NUM> and the second mounting portion <NUM>, such that the battery pack <NUM> can be more stably supported on the supporting frame <NUM>.

In this embodiment, the battery pack <NUM> is directly mounted on the supporting frame <NUM>, and in order to form the cushioning between the supporting frame <NUM> and the battery pack <NUM>, cushion pads <NUM> are arranged between the bottom of the battery pack <NUM> and the arch-shaped supporting portion <NUM>, the first mounting portion <NUM> and the second mounting portion <NUM> on the supporting frame <NUM>, and the cushion pads <NUM> can further damp vibration of the battery pack <NUM> during operation; preferably, the cushion pads <NUM> in this embodiment are fixed at the bottom of the battery pack <NUM>. If the battery pack <NUM> falls, the cushion pads <NUM> at the bottom of the battery pack will contact the ground before the battery pack <NUM>, so as to play a role of buffer protection.

In this embodiment, a side part of the first mounting portion <NUM> is vertically aligned with a side part on a same side of the supporting frame <NUM>, and the second mounting portion <NUM> is of a cantilever structure formed by extending the side part of the supporting frame <NUM> outwards. When the battery pack <NUM> is mounted on the supporting frame <NUM>, the side part of the battery pack <NUM> supported on the first mounting portion <NUM> is substantially aligned with the side part of the supporting frame <NUM>, and the side part of the battery pack <NUM> supported on the second mounting portion <NUM> extends out of the side part of the supporting frame <NUM>, without any mechanism arranged on the lower side of the second mounting portion <NUM>.

In this embodiment, referring to <FIG>, <FIG>, the battery pack <NUM> comprises a box body <NUM>, and a battery set <NUM> and a battery management system <NUM> arranged in the box body <NUM>, wherein an upper inclination angle of the box body <NUM> on one side of the second mounting portion <NUM> is set as a mounting space for the battery management system <NUM>, and a rest part of the box body <NUM> is set as a mounting space for the battery set <NUM>.

In this embodiment, one side end of the battery pack <NUM> is supported on the first mounting portion <NUM> and is substantially aligned with the side part of the supporting frame <NUM>, the other side end of the battery pack <NUM> is supported on the second mounting portion <NUM> and extends out of the side part of the supporting frame <NUM>, and the center of gravity <NUM> of the battery pack <NUM> makes an offset toward the side extending out of the supporting frame <NUM>. However, the closer the center of gravity <NUM> of the battery pack <NUM> is to the center of the motor <NUM>, the better the overall stability of the combination of the battery pack <NUM> and the motor <NUM>. Since the per unit weight of a battery set <NUM> is much greater than that of the battery management system <NUM>, in the present application, through the arrangement of the battery management system <NUM> on an upper inclination angle of the box body <NUM> on one side of the second mounting portion <NUM>, and filling the rest part of the box body <NUM> with the battery set <NUM>, the center of gravity <NUM> of the battery pack <NUM> can be close to one side of the center of the motor <NUM> as far as possible, and meanwhile the space can be made full use of.

Referring to <FIG>, in this embodiment, supports <NUM> are arranged on both sides of the motor <NUM> on the base <NUM>, lower parts of both sides of the supporting frame <NUM> are respectively mounted on the supports <NUM> on the corresponding sides through elastic vibration damping bodies <NUM>, and the elastic vibration damping bodies <NUM> on both sides are obliquely arranged, such that axes of the elastic vibration damping bodies <NUM> on both sides intersect above. The center of gravity <NUM> of the battery pack <NUM> is located in a lower area where the axes of the elastic vibration damping bodies <NUM> on both sides intersect.

In the present application, the battery pack <NUM> is designed according to the above scheme, such that the center of gravity <NUM> of the battery pack <NUM> is centered as much as possible, and then the inclination angles of the elastic vibration damping bodies <NUM> on both sides of the supporting frame <NUM> are designed, such that the center of gravity <NUM> of the battery pack <NUM> is located in the lower area where the axes of the elastic vibration damping bodies <NUM> on both sides intersect. Through the control of the center of gravity <NUM> of the battery pack <NUM> to be located in the lower area where the axes of the elastic vibration damping bodies <NUM> on both sides intersect, the battery pack <NUM> is stably supported, and a good vibration damping effect is also provided for the battery pack <NUM>, and the use requirements of the working machine with large vibration can be satisfied.

In this embodiment, referring to <FIG>, the battery set <NUM> is supported in the box body <NUM> through vibration damping block <NUM>. Specifically, the box body <NUM> in this embodiment comprises a lower box body <NUM> and an upper box body <NUM>, wherein vibration damping blocks <NUM> are arranged at the bottom and the periphery of the lower box body <NUM>, and at the top and the periphery of the upper box body <NUM>, and the vibration damping blocks <NUM> can play a role of vibration damping and buffering on the battery set <NUM> in the box body <NUM>.

In this embodiment, referring to <FIG>, the battery set <NUM> comprises a battery cell holder <NUM> and a plurality of cylindrical battery cells <NUM> longitudinally distributed on the battery cell holder <NUM> in parallel. The battery set <NUM> adopts a cylindrical battery cell structure which is convenient to form a unique molding of the battery pack <NUM>, and then it is easy to realize the surrounding design of the battery pack <NUM> on the periphery of the motor <NUM>. The cylindrical battery cells <NUM> distributed in a mode of arranging in the same direction as the output direction have the advantages of lower center of gravity, better vibration absorption performance and more stable overall structure compared with those distributed in a vertical arrangement mode.

For reference, the cylindrical battery cells <NUM> are distributed in a regular triangle shape, so as to improve the arrangement efficiency of the cylindrical battery cells <NUM>.

As shown in <FIG>, Embodiment <NUM> provides an electrically-driven power unit of a compact battery pack; Embodiment <NUM> is different from Embodiment <NUM> in that the output shaft of the motor <NUM> in Embodiment <NUM> is in a vertical direction.

The direction of the output shaft of the motor <NUM> of the power unit is divided into a horizontal direction and a vertical direction, and the present invention can simultaneously satisfy the requirements of adapting to the two output directions due to its universality.

The battery pack <NUM> is specially shaped with a concave bottom, so that the battery pack <NUM> and the motor <NUM> can be assembled and combined with good space efficiency even when the output shaft of the motor <NUM> is in a vertical direction. Here, the working machine having vertical output requirements can be mounted properly only by individually setting the supporting frame <NUM>.

In a case that the output shaft of the motor <NUM> is in the horizontal direction, the motor <NUM> and the battery pack <NUM> are designed in a general manner, and in this embodiment, various types of working machines can be mounted properly only by specially setting the supporting frame <NUM> and the appearance shell.

Claim 1:
An electrically-driven power unit of a compact battery pack, comprising a motor (<NUM>) and a battery pack (<NUM>), wherein the motor is mounted on a Z base (<NUM>), the battery pack is supported on an upper part of the motor through a supporting frame (<NUM>), the supporting frame is shaped around a periphery of the motor, an arch-shaped supporting portion (<NUM>) matched with the upper part of the motor is formed on an upper part of the supporting frame, characterized by a concave portion (<NUM>) matched with the arch-shaped supporting portion is arranged at a bottom of the battery pack, and the arch-shaped supporting portion of the supporting frame is supported in the concave portion of the battery pack.