CN220775434U

CN220775434U - Power transmission system

Info

Publication number: CN220775434U
Application number: CN202322443432.7U
Authority: CN
Inventors: 朱艳强; 庄宪
Original assignee: Globe Jiangsu Co Ltd
Current assignee: Globe Jiangsu Co Ltd
Priority date: 2023-09-07
Filing date: 2023-09-07
Publication date: 2024-04-12
Anticipated expiration: 2033-09-07

Abstract

An electric power transmission system includes an electric vehicle configured with a traveling assembly; the first power supply device is accommodated in the electric vehicle and is configured to be electrically connected with the walking assembly so as to drive the walking assembly to work; the first interface is electrically connected with the first power supply device so that current flows from the first power supply device to the first interface; the second power supply device is detachably connected with the first interface; the maximum current output by the first interface is 100A, and a voltage conversion circuit is configured on a flow path of the current from the first interface to the second power supply device. Therefore, the high-voltage high-capacity battery pack in the electric vehicle can be used for charging the low-voltage low-capacity battery pack such as a handheld electric tool, the capacity of the high-voltage high-capacity battery pack is allocated in a diversified mode, electric energy sharing can be realized, emergency can be realized, a split type multi-purpose battery pack is formed, the expansion capacity of electric products is improved, the application scene of the products is wider, the electric vehicle is suitable for ecological chain construction of the products, and the market applicability is strong.

Description

Power transmission system

Technical Field

The application belongs to the technical field of storage and charging, and particularly relates to an electric power transmission system.

Background

Because of the characteristics of easy portability and light operation, the small-sized handheld electric tool is favorable for improving the use experience and the operation convenience and is favored by users.

However, since the power supply battery of the hand-held electric tool is usually a low-voltage small-capacity battery pack, the endurance is relatively poor, and the situation that charging and recharging are required often occurs, and charging of the power supply battery of the hand-held electric tool is usually performed in an AC/DC or DC/DC mode.

Because the outdoor condition often has no alternating current power supply, the DC/DC mode is generally adopted to charge the power supply battery, and the DC/DC mode needs to be provided with an additional control circuit and specially carry portable energy storage equipment.

Disclosure of Invention

In view of the above-described drawbacks of the prior art, an object of the present application is to provide an electric power transmission system applied to battery charging.

To achieve the above and other related objects, the present application provides an electric power transmission system including:

an electric vehicle provided with a traveling assembly;

a first power supply device housed in the electric vehicle, the first power supply device being configured to be electrically connected to the traveling assembly to drive the traveling assembly to operate;

a first interface electrically connected to the first power supply device to enable current to flow from the first power supply device to the first interface;

the second power supply device is detachably connected with the first interface;

the current output by the first interface to the outside is 100A at maximum, and a voltage conversion circuit is configured on a flow path of the current from the first interface to the second power supply device.

In an alternative embodiment of the present application, the first power supply device and the second power supply device have different voltages.

In an alternative embodiment of the present application, the capacity of the first power supply device is larger than the capacity of the second power supply device.

In an alternative embodiment of the present application, the capacity of the first power supply device is 6kw.h-40kw.h.

In an alternative embodiment of the present application, the energy density of the first power supply means is greater than 100Wh/kg.

In an optional embodiment of the present application, the second power supply device is configured on the electric vehicle, and the second power supply device is connected to the first interface through a cable or a connection terminal, so as to receive the current flowing from the first interface.

In an optional embodiment of the present application, the mower is provided with a carrying platform, the second power device is placed on the carrying platform, and a distance between the carrying platform and the ground is between 0.6m and 1.3 m.

In an alternative embodiment of the present application, the at least one interface of the second power supply device directly or indirectly receives the load bearing capacity from at least one component of the electric vehicle.

In an alternative embodiment of the present application, the second power supply device is provided with at least one detachable battery pack.

In an alternative embodiment of the present application, the voltage conversion circuit is a bidirectional voltage conversion circuit; and current flows from the second power supply device to the first power supply device through the bidirectional voltage conversion circuit and the first interface in sequence.

In an alternative embodiment of the present application, the voltage conversion circuit comprises a DC/DC module.

In an alternative embodiment of the present application, the DC/DC module is a non-isolated DC/DC module.

In an alternative embodiment of the present application, the electric vehicle is a mower, the mower is provided with a cutter assembly, and the first power supply device is configured to be electrically connected with the walking assembly and the cutter assembly so as to drive the walking assembly and/or the cutter assembly to work.

In an optional embodiment of the present application, the power supply interface of the functional device is detachably connected to the first interface, and current flows from the first interface to the functional device to drive the functional device to act.

In an alternative embodiment of the present application, the functional device comprises a blower assembly or a snow sweeping assembly mounted on the electric vehicle.

To achieve the above and other related objects, the present application also provides another power transmission system including:

an electric vehicle;

a first power supply device housed in the electric vehicle;

the first interface is electrically connected with the first power supply device, and the maximum current output by the first interface to the outside is 100A;

a second interface electrically connected with the first power supply device;

a second power supply device configured to house at least one detachable battery pack;

in a first state, the second power supply device is electrically connected with the first interface so as to receive current flowing out from the first power supply device;

in a second state, the second power supply device is electrically connected to the second interface so that current flows from the second power supply device to the first power supply device.

In an alternative embodiment of the present application, in the first state, a voltage conversion circuit is disposed on a current path from the first power supply device to the second power supply device.

According to the electric power transmission system, the interface for discharging outwards is arranged on the electric vehicle, the high-voltage large-capacity battery pack is utilized to charge the low-voltage small-capacity battery pack, the high-voltage large-capacity battery pack of the electric vehicle can be utilized to charge and supplement electricity for the low-voltage small-capacity battery pack such as a handheld electric tool under the condition that alternating current power supply does not exist outdoors, an AC/DC charger is not required to be additionally configured, the built-in battery energy in the electric vehicle can be distributed and used in a diversified mode, electric energy sharing can be achieved, emergency can be achieved, the split type multi-purpose battery pack is formed, the product expansion capacity is improved, the product application scene is wider, the electric power transmission system is suitable for product ecological chain construction, and market applicability is high.

According to the power transmission system, the interface for discharging is arranged on the electric vehicle, the high-voltage large-capacity battery pack is utilized to charge the low-voltage small-capacity battery pack, an additional charge management system is not needed, and the small-capacity batteries serving as the charged system cannot influence each other.

According to the power transmission system, the low-voltage small-capacity battery pack is charged by the high-voltage large-capacity battery pack in a non-isolated DC/DC buck conversion mode, so that the loss in the voltage conversion process is effectively improved, and the conversion efficiency is improved.

According to the electric power transmission system, the interface with the charging function is arranged on the electric vehicle, when the electric vehicle is powered off by the built-in high-voltage high-capacity battery pack in the outdoor use process, the electric vehicle can be charged by the high-voltage high-capacity battery pack of the electric vehicle by utilizing the low-voltage low-capacity battery pack such as the hand-held electric tool and the like when the electric vehicle cannot walk or start, and the electric vehicle is powered on to a charging area such as a home.

Drawings

Fig. 1 is a schematic diagram of an electric power transmission system according to an embodiment of the present application.

Fig. 2 is a schematic diagram of an electric power transmission system in another embodiment of the present application.

Fig. 3 is a schematic view of an electric power transmission system according to another embodiment of the present application.

Fig. 4 shows a schematic view of the second power supply device configured on the mower.

Fig. 5 shows another schematic view of the second power supply device configured on a mower.

Description of the reference numerals:

10. an electric vehicle; 11. a first power supply device; 12. a first interface; 13. a second interface; 14. a front load-bearing platform; 15. a rear load-bearing platform; 20. a voltage conversion circuit; 30. a second power supply device; 40. low voltage small capacity battery pack.

Detailed Description

Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application.

It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings, rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

Fig. 1 shows a schematic diagram of an embodiment of the power delivery system of the present application. As shown in fig. 1, the electric power transmission system includes an electric vehicle 10, a first power supply device 11, a first interface 12, a second power supply device 30, and a voltage conversion circuit 20. Wherein, the electric vehicle 10 is provided with a traveling assembly; a first power supply device 11 housed in the electric vehicle 10, the first power supply device 11 being configured to be electrically connected to the traveling assembly to drive the traveling assembly to operate; a first interface 12 electrically connected to the first power supply device 11 so that current flows from the first power supply device 11 to the first interface 12; a second power supply device 30 detachably connected to the first interface 12; the voltage conversion circuit 20 is disposed in a flow path of the current from the first interface 12 to the second power supply device 30, so that the low-voltage small-capacity battery pack 40 placed in the second power supply device 30 can be charged with the high-voltage large-capacity battery pack as the first power supply device 11.

In an embodiment, the electric vehicle 10 may be a road or non-road vehicle such as a mower, a sightseeing vehicle, a golf cart, or an electric car, and the first power supply device 11 is a built-in battery in the electric vehicle 10, which is a high-voltage large-capacity battery pack. The capacity of the first power supply means 11 is 6kw.h-40kw.h, for example, 8kw.h,18kw.h,24kw.h,30kw.h,36kw.h; the energy density of the first power supply means 11 is greater than 100Wh/kg.

In one embodiment, the second power supply device 30 is a small-pack charging box, in which one or more detachable battery packs are configured, and the battery packs are low-voltage small-capacity battery packs 40 such as handheld electric tools, and the capacity of the second power supply device 30 is less than 8kw.h, for example, 4.8kw.h. The hand-held power tool may be, for example, a hand-held power chain saw, a hand-held power blower, a hand-held vacuum cleaner, a hand-held electric drill, a hand-held power pruner, or the like. In one embodiment, the second power device 30 is a 6-pack charging box that can charge the 6 low-voltage small-capacity battery packs 40.

The voltage of the first power supply device 11 is different from the voltage of the second power supply device 30, and the voltage of the first power supply device 11 is greater than the voltage of the second power supply device 30.

The capacity of the first power supply device 11 is different from the capacity of the second power supply device 30. Specifically, the capacity of the first power supply device 11 is larger than the capacity of the second power supply device 30, wherein the capacity of the power supply device is defined as the original capacity when the battery pack is fully charged.

As shown in fig. 1, the first interface 12 is an interface provided in the electric vehicle 10 for supplying power to the external output, for example, an ETO interface, and the current of the external output of the first interface 12 is 100A at most, that is, the current of the external output of the first interface 12 is less than or equal to 100A, so as to meet the requirement of high-power supply, and the first interface can charge the low-voltage low-capacity battery pack 40 in the second power supply device 30 or supply power to the additional functional devices on the electric vehicle 10.

In one embodiment, the voltage conversion circuit 20 is disposed on a current path from the first power supply device 11 to the second power supply device 30, and the voltage conversion circuit 20 is disposed between the first power supply device 11 and the second power supply device 30.

In other embodiments, the voltage conversion circuit 20 may be disposed in the first power supply device 11 or the second power supply device 30.

In an embodiment, the voltage conversion circuit 20 includes a unidirectional DC/DC module (or a bidirectional DC/DC module, of course) for reducing the high voltage output by the first interface 12 to a low voltage to charge the detachable battery pack in the second power supply device 30. The voltage reduction mode can effectively reduce the loss in the voltage conversion process and improve the conversion efficiency. The DC/DC module may be, for example, an isolated or non-isolated DC/DC module.

To further reduce losses during voltage conversion and improve conversion efficiency, the voltage conversion circuit 20 may employ a non-isolated DC/DC module. Compared with the isolated DC/DC module, the non-isolated DC/DC module has less energy loss and higher efficiency in the voltage conversion process, and compared with the isolated DC/DC module, the non-isolated DC/DC module has smaller volume and lower cost under the condition of the same output power and the same output performance because the transformer is not needed for electric isolation between input and output.

In an embodiment, the second power device 30 is disposed on the electric vehicle 10, and the second power device 30 is connected to the first interface 12 through a cable or a connection terminal to receive the current flowing from the first interface 12, and of course, the second power device 30 may also be disposed independently, for example, on a ground or a platform beside the electric vehicle 10.

Wherein the configuration on the electric vehicle 10 may take the form of a hidden or partially exposed form, such as being placed on a platform of the electric vehicle 10 or being suspended on a component of the electric vehicle 10, or being removably received in a confined space of the electric vehicle 10, such that at least one interface of the second power supply device 30 directly or indirectly receives a load bearing capacity from at least one component of the electric vehicle 10.

In a specific embodiment, the electric vehicle 10 is a mower configured with a walk assembly and a cutter assembly, and the first power device 11 is configured to be electrically connected to the walk assembly and the cutter assembly to drive the walk assembly and/or the cutter assembly into operation.

The mower is provided with a carrying platform for carrying objects, comprising a front carrying platform and/or a rear carrying platform, and the second power supply device 30 can be placed on the front carrying platform 14 as shown in fig. 4, and the second power supply device 30 can be placed on the rear carrying platform 15 as shown in fig. 5. The distance H (defined as the first distance) of the carrying platform from the ground is 0.6m-1.3m, preferably 0.7m-1.0m, further preferably 0.8m-0.9m; when the second power supply device 30 is laid on the ground, the distance from the center of gravity to the ground (corresponding to the distance h from the center of gravity to the carrying platform when the second power supply device 30 is laid on the carrying platform, which is defined as the second distance) is 2cm-60cm, preferably 10-20cm, and when the second power supply device 30 is placed on the carrying platform of the mower, the distance from the center of gravity to the ground is the sum of the first distance and the second distance.

In an embodiment, for convenience of use, a socket port may be directly disposed on the carrying platform as the first interface 12, and a connection terminal is disposed on the second power device 30, where when the second power device 30 is placed on the carrying platform, the connection terminal on the second power device 30 may be plugged on the socket port, so as to implement electrical connection.

Optionally, the power transmission system may further include some functional devices disposed on the electric vehicle 10 for extending the functions of the electric vehicle 10, where the functional devices are functional accessories that can be directly driven by the first interface 12 of the electric vehicle 10, and a power supply interface of the functional devices is detachably connected to the first interface 12, and current flows from the first interface 12 to the functional devices to drive the functional devices to operate. The functional device can be a blowing component or a snow sweeping component arranged at the front end of the mower.

The power transmission system can charge the low-voltage small-capacity battery pack 40 placed in the second power supply device 30 by utilizing the high-voltage large-capacity battery pack of the electric vehicle 10 under the condition that no alternating current power is supplied outdoors, an AC/DC charger is not required to be additionally configured, the built-in battery energy in the electric vehicle 10 is subjected to diversified distribution and use, electric energy sharing can be realized, emergency can be realized, a separated multi-purpose bag is formed, the product expansion capacity is improved, the product application scene is wider, the system is suitable for product ecological chain construction, and the market applicability is strong. And the second power supply device 30 may automatically perform charging power distribution and selectively access charging according to the number of battery packs actually accessed when charging the plurality of low-voltage small-capacity battery packs 40.

In an actual application scenario, when the low-voltage small-capacity battery pack 40 in the handheld electric tool is not powered, the battery pack can be taken down from the handheld electric tool and put into the second power supply device 30, the second power supply device 30 is connected with the first interface 12 through a cable or a connection terminal, so as to receive the current flowing out from the first interface 12 to charge the battery pack in the second power supply device 30, and after the battery pack is fully charged, the battery pack can be assembled into the handheld electric tool to supply power to the handheld electric tool, so that the purpose of electric energy sharing is achieved.

Fig. 2 shows a schematic view of another embodiment of the power delivery system of the present application. As shown in fig. 2, the electric power transmission system includes an electric vehicle 10, a first power supply device 11, a first interface 12, a second power supply device 30, and a voltage conversion circuit 20.

Wherein, the electric vehicle 10 is provided with a traveling assembly; a first power supply device 11 housed in the electric vehicle 10, the first power supply device 11 being configured to be electrically connected to the traveling assembly to drive the traveling assembly to operate; a first interface 12 electrically connected to the first power supply device 11 so that a current flows from the first power supply device 11 to the first interface 12 and a current also flows from the first interface 12 to the first power supply device 11; a second power supply device 30 detachably connected to the first interface 12; the voltage conversion circuit 20 is a bidirectional voltage conversion circuit, and is disposed between the first power supply device 11 and the second power supply device 30.

In one embodiment, the first interface 12 is an interface having both the charge and discharge functions, and may be used not only as an interface for supplying power to the external output of the electric vehicle 10, but also as a charging interface for charging the built-in battery of the electric vehicle 10. The maximum current output by the first interface 12 to the outside is 100A, that is, the current output by the first interface 12 to the outside is less than or equal to 100A, so as to meet the requirement of high-power supply, and the first interface can charge the low-voltage low-capacity battery pack 40 in the second power supply device 30 or supply power for additional functional devices on the electric vehicle 10.

In one embodiment, the voltage conversion circuit 20 is disposed on a current path from the first power supply device 11 to the second power supply device 30, and the voltage conversion circuit 20 is disposed between the first power supply device 11 and the second power supply device 30. In other embodiments, the voltage conversion circuit 20 may be disposed in the first power supply device 11 or the second power supply device 30.

The voltage conversion circuit 20 is a bidirectional voltage conversion circuit, such as a bidirectional DC/DC module. On the one hand, the current can flow from the first power supply device 11 to the second power supply device 30 through the first interface 12 and the bidirectional voltage conversion circuit, the high-voltage large-capacity battery pack of the first power supply device 11 is utilized to charge the low-voltage small-capacity battery pack 40 placed in the second power supply device 30, and the loss in the voltage conversion process can be effectively reduced by adopting a voltage reduction mode, so that the conversion efficiency is improved; on the other hand, current can flow from the second power supply device 30 to the first power supply device 11 through the bidirectional voltage conversion circuit and the first interface 12, and the low-voltage small-capacity battery pack 40 placed in the second power supply device 30 is used for supplementing the high-voltage large-capacity battery pack of the electric vehicle 10, so that the bidirectional power transmission function is realized. The bidirectional DC/DC module may be, for example, an isolated or non-isolated bidirectional DC/DC module.

To further reduce losses during voltage conversion and improve conversion efficiency, the voltage conversion circuit 20 may employ a bidirectional non-isolated bidirectional DC/DC module. Compared with the isolated bidirectional DC/DC module, the non-isolated bidirectional DC/DC module has the advantages of less energy loss and higher efficiency in the voltage conversion process, and compared with the isolated bidirectional DC/DC module, the non-isolated bidirectional DC/DC module has smaller volume and lower cost under the condition of same output power and same output performance because no transformer is needed for electric isolation between input and output.

The second power supply device 30 is a small-pack charging box, in which one or more detachable battery packs are arranged, the battery packs are low-voltage small-capacity battery packs 40 such as hand-held electric tools, and the capacity of the second power supply device 30 is smaller than 8kw.h, for example, 4.8kw.h. The hand-held power tool may be, for example, a hand-held power chain saw, a hand-held power blower, a hand-held vacuum cleaner, a hand-held electric drill, a hand-held power pruner, or the like. In one embodiment, the second power supply device 30 is a 6-pack charging box, which can charge 6 low-voltage small-capacity battery packs 40, or can discharge by using the internal low-voltage small-capacity battery packs 40 to supplement the power for the first power supply device 11.

The second power supply device 30 is disposed on the electric vehicle 10. On the one hand, the second power supply device 30 may be connected to the first interface 12 through a cable or a connection terminal to receive the current flowing out from the first interface 12; on the other hand, the second power supply device 30 may be connected to the second interface 13 through a cable or a connection terminal to output a current to the first power supply device 11 through the second interface 13. Of course, the second power supply device 30 may be provided independently, and may be placed on the ground or a platform beside the electric vehicle 10, for example.

In a specific embodiment, the electric vehicle 10 is a mower configured with a cutter assembly, and the first power device 11 is configured to be electrically connected to the walking assembly and the cutter assembly to drive the walking assembly and/or the cutter assembly into operation.

In order to be convenient to use, the socket port can be directly arranged on the bearing platform to serve as the first interface 12, the connecting terminal is arranged on the second power supply device 30, and when the second power supply device 30 is placed on the bearing platform, the connecting terminal on the second power supply device 30 can be plugged on the socket port to realize electric connection.

In practical applications, the power transmission system shown in fig. 2 may be utilized, when the low-voltage small-capacity battery pack 40 in the hand-held electric tool is deficient, the battery pack may be removed from the hand-held electric tool and placed into the second power supply device 30, the second power supply device 30 is connected to the first interface 12 through a cable or a connection terminal, the high-voltage large-capacity battery pack of the electric vehicle 10 is utilized to charge the low-voltage small-capacity battery pack 40 placed in the second power supply device 30, no additional AC/DC charger is required, and during charging, charging energy distribution and selective access charging may be automatically performed according to the number of battery packs actually accessed. After being fully charged, the electric power device can be assembled to a handheld electric tool to supply power to the handheld electric tool, so that the energy of the built-in battery in the electric vehicle 10 is distributed and used in a diversified mode, electric energy sharing can be achieved, emergency can be achieved, a separated type multi-purpose bag is formed, the expansion capacity of products is improved, the application scene of the products is wider, the electric power device is suitable for ecological chain construction of the products, and market applicability is strong.

When the built-in battery of the electric vehicle 10 is severely deficient outdoors and cannot walk or start, the low-voltage small-capacity battery pack 40 of the portable electric tool carried around can be placed into the second power supply device 30, and the low-voltage small-capacity battery pack 40 is utilized to supplement the high-voltage large-capacity battery pack of the electric vehicle 10 to meet the requirement of use in the temporary emergency.

In the power transmission system according to the present embodiment, the electric vehicle 10 is provided with the interface for discharging the electric power to the outside, so that the low-voltage small-capacity battery pack 40 is charged with the high-voltage large-capacity battery pack, and an additional charge management system is not required, so that the small-capacity batteries as the charged system do not affect each other.

Fig. 3 shows a schematic view of another embodiment of the power delivery system of the present application. As shown in fig. 3, the electric power transmission system includes an electric vehicle 10, a first power supply device 11, a first interface 12, a second interface 13, and a second power supply device 30.

The first power supply device 11 is housed in the electric vehicle 10; the first interface 12 is electrically connected to the first power supply device 11 as a discharge interface; the second interface 13 is electrically connected with the first power supply device 11; the second interface 13 is independent of the first interface 12, the second interface 13 serves as an interface for charging a built-in battery of the electric vehicle 10, and the second interface 13 is electrically connected to the first power supply device 11.

The entire power transmission system has two states, in the first state, the second power supply device 30 is electrically connected to the first interface 12 to receive the current flowing from the first power supply device 11; in the second state, the second power supply device 30 is electrically connected to the second interface 13 such that current flows from the second power supply device 30 to the first power supply device 11. Thus, the high-voltage large-capacity battery pack of the electric vehicle 10 can be charged by the high-voltage large-capacity battery pack of the electric vehicle 10 through the first interface 12, and the low-voltage small-capacity battery pack 40 placed in the second power supply device 30 can be charged by the low-voltage small-capacity battery pack 40 placed in the second power supply device 30 through the second interface 13, so that the bidirectional power transmission function is realized.

The capacity of the first power supply device 11 is different from the capacity of the second power supply device 30, specifically, the capacity of the first power supply device 11 is larger than the capacity of the second power supply device 30, wherein the capacity of the power supply device is defined as the original capacity when the battery pack is fully charged.

The first interface 12 is an interface provided in the electric vehicle 10 for supplying power to the external output, for example, an ETO interface, and the maximum current of the first interface 12 to the external output is 100A, that is, the current of the first interface 12 to the external output is less than or equal to 100A, so as to meet the requirement of high-power supply, and the first interface can charge the low-voltage low-capacity battery pack 40 in the second power supply device 30 or supply power to additional functional devices on the electric vehicle 10.

As shown in fig. 3, in the first state, the voltage conversion circuit 20 is disposed on a flow path of the current from the first power supply device 11 to the second power supply device 30, that is, the voltage conversion circuit 20 is disposed between the first power supply device 11 and the second power supply device 30. In other embodiments, the voltage conversion circuit 20 may be disposed in the first power supply device 11 or the second power supply device 30.

The voltage conversion circuit 20 employs a unidirectional DC/DC module (of course, a bidirectional DC/DC module) for reducing the high voltage power output from the first interface 12 to a low voltage power to charge the detachable battery pack in the second power supply device 30. The voltage reduction mode can effectively reduce the loss in the voltage conversion process and improve the conversion efficiency. The DC/DC module may be, for example, an isolated or non-isolated DC/DC module.

It should be noted that, in an alternative embodiment, when the voltage conversion circuit 20 employs a unidirectional DC/DC module, in the second state, another voltage conversion circuit may be disposed on the current path from the second power supply device 30 to the first power supply device 30; when the voltage conversion circuit 20 adopts the bidirectional DC/DC module, in the second state, the bidirectional DC/DC module is shared on the current path from the second power supply device 30 to the first power supply device 30 to boost the voltage, and the low voltage output from the second interface 13 is boosted to the high voltage to supplement the power to the first power supply device 11.

The second power supply device 30 is disposed on the electric vehicle 10, and the second power supply device 30 is connected to the first interface 12 through a cable or a connection terminal to receive the current flowing from the first interface 12, however, the second power supply device 30 may be disposed independently, for example, on a floor or a platform beside the electric vehicle 10.

Optionally, the power transmission system may further include some functional devices disposed on the electric vehicle 10 for extending the functions of the electric vehicle 10, where the functional devices are functional accessories that can be directly driven by the first interface 12 of the electric vehicle 10, and a power supply interface of the functional devices is detachably connected to the first interface 12, and current flows from the first interface 12 to the functional devices to drive the functional devices to operate. The functional device can be a blowing component or a snow sweeping component arranged at the front end of the mower. In practical applications, the power transmission system shown in fig. 3 may be utilized, when the low-voltage small-capacity battery pack 40 in the handheld electric tool is not powered, the battery pack may be removed from the handheld electric tool and placed into the second power device 30, the second power device 30 is connected to the first interface 12 through a cable or a connection terminal, so as to receive the current flowing from the first interface 12 to charge the battery pack in the second power device 30, and after the battery pack is fully charged, the battery pack may be assembled into the handheld electric tool to supply power to the handheld electric tool, thereby providing a relatively convenient electric energy expansion.

When the built-in battery of the electric vehicle 10 is severely deficient outdoors and cannot walk or start, the low-voltage small-capacity battery pack 40 of the portable electric tool carried around can be placed into the second power supply device 30, the second power supply device 30 is connected with the second interface 13 through a cable or a connection terminal, and the low-voltage small-capacity battery pack 40 is utilized to supplement the high-voltage large-capacity battery pack of the electric vehicle 10 to meet the use in the temporary emergency.

To sum up, the power transmission system of this application, through setting up the interface that has the external discharge on electric vehicle 10, utilize high-voltage large capacity battery package to charge to low pressure small capacity battery package 40, can be under the outdoor condition that does not have the alternating current power supply, utilize electric vehicle 10's high-voltage large capacity battery package to charge for low pressure small capacity battery package 40 such as handheld electric tool class and mend the electricity, need not additionally to dispose the AC/DC charger, can carry out diversified distribution to the built-in battery energy in the electric vehicle 10 and use, can form electric energy sharing like this, can meet an urgent need again, form a packet of multi-purpose of disconnect-type, increase the product expansion ability, the product application scenario is wider, be fit for the construction of product ecological chain, market suitability is strong.

In the power transmission system of the present application, the high-voltage large-capacity battery pack is used to charge the low-voltage small-capacity battery pack 40 by providing the electric vehicle 10 with the interface for external discharge, and an additional charge management system is not required, so that the small-capacity batteries as the charged system do not affect each other.

According to the power transmission system, the low-voltage small-capacity battery pack 40 is charged by the high-voltage large-capacity battery pack in a non-isolated DC/DC buck conversion mode, so that the loss in the voltage conversion process is effectively improved, and the conversion efficiency is improved.

According to the power transmission system, the interface with the charging function is arranged on the electric vehicle 10, when the electric vehicle 10 is powered down by the built-in high-voltage high-capacity battery pack in the outdoor use process, the high-voltage high-capacity battery pack of the electric vehicle 10 can be supplemented by the low-voltage low-capacity battery pack 40 such as the hand-held electric tool type and the like when the electric vehicle cannot walk or start, and the electric vehicle 10 is powered on to a charging area, such as a home for charging, so that the user experience is improved.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

The above embodiments are only for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An electric power transmission system, comprising:

an electric vehicle provided with a traveling assembly;

the first interface outputs a maximum current of 100A, and a voltage conversion circuit is arranged on a flow path of the current from the first power supply device to the second power supply device.

2. The power delivery system of claim 1, wherein the first power supply device is at a different voltage than the second power supply device.

3. The power delivery system of claim 1, wherein a capacity of the first power supply device is greater than a capacity of the second power supply device.

4. A power transmission system according to claim 3, wherein the first power supply means has a capacity of 6kw.h-40kw.h.

5. The power delivery system of claim 1, wherein the energy density of the first power supply device is greater than 100Wh/kg.

6. The power transmission system according to claim 1, wherein the second power supply device is provided on the electric vehicle, and the second power supply device is connected to the first interface through a cable or a connection terminal to receive the current flowing from the first interface.

7. The power delivery system of claim 6, wherein at least one interface of the second power device directly or indirectly receives a load bearing force from at least one component of the electric vehicle.

8. The power delivery system of claim 1, wherein the second power device has at least one removable battery pack disposed therein.

9. The power delivery system of claim 1, wherein the voltage conversion circuit is a bi-directional voltage conversion circuit; current flows from the second power supply device to the first power supply device through the bidirectional voltage conversion circuit and the first interface.

10. The power delivery system of claim 1, wherein the voltage conversion circuit is a non-isolated DC/DC module.

11. The power delivery system of claim 1, wherein the electric vehicle is a mower configured with a cutter assembly, the first power device being configured to electrically connect with the walking assembly and the cutter assembly to drive the walking assembly and/or the cutter assembly into operation.

12. The power delivery system of claim 11, wherein the mower is provided with a carrying platform, the second power device is disposed on the carrying platform, and the distance between the carrying platform and the ground is between 0.6m and 1.3 m.

13. The power delivery system of claim 1, further comprising a functional device, a power interface of the functional device being detachably connected to the first interface, current flowing from the first interface to the functional device to actuate the functional device.

14. The power delivery system of claim 13, wherein the functional device comprises a blower assembly or a snow sweeping assembly mounted on the electric vehicle.

15. An electric power transmission system, comprising:

an electric vehicle;

a first power supply device housed in the electric vehicle;

a second interface electrically connected with the first power supply device;

16. The power transmission system according to claim 15, wherein in the first state, a voltage conversion circuit is provided in a flow path of the current from the first power supply device to the second power supply device.

17. The power delivery system of claim 15, wherein the capacity of the first power device is greater than the capacity of the second power device.

18. The power transmission system according to claim 15, wherein the second power supply device is provided on the electric vehicle, and the second power supply device is connected to the first interface via a cable or a connection terminal to receive the current flowing from the first interface.

19. The power delivery system of claim 18, wherein at least one interface of the second power device directly or indirectly receives a load bearing force from at least one component of the electric vehicle.