Outdoor travelling device and battery pack for outdoor travelling device

Abstract

An outdoor travelling device (100) and a battery pack (21) for the outdoor travelling device (100). The outdoor travelling device (100) comprises: a power supply (20) for supplying power to an electrical device in a vehicle body (10); the power supply (20) comprises at least one battery pack (21), the battery pack (21) comprising a battery pack housing (211) and a battery cell module (212) accommodated in the battery pack housing (211); the battery pack housing (211) is supported by the vehicle body (10); the battery cell module (212) comprises a plurality of battery cells (2121); each battery pack (21) is configured with nominal energy, the ratio of the nominal energy of a single battery pack (21) to the number of the battery cells contained in the single battery pack (21) being greater than or equal to 20 Wh / piece.

Description

Outdoor walking device and battery pack for outdoor walking device

[0001] This application claims priority to Chinese Patent Application No. 202411323738.1, filed on September 20, 2024, and Chinese Patent Application No. 202521708915.8, filed on August 12, 2025, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to an electric power tool, for example, to an outdoor walking device and a battery pack for an outdoor walking device. BACKGROUND

[0003] Outdoor walking devices in the related art are used for outdoor work. For example: utility vehicles, agricultural machinery vehicles, farmer vehicles, sand vehicles, golf vehicles, lawn mowers, etc. Outdoor walking devices generally include an energy storage device, a motion prime mover or a motor supported by the energy of the energy storage device, a load element driven by the motor, and the load element generally includes walking wheels and work accessories, etc. The energy storage device in the related art has a large number of battery cells, which is not convenient for management and disassembly.

[0004] This section provides background information relating to the present application, which is not necessarily prior art. SUMMARY

[0005] The present application is to solve or at least alleviate some or all of the above problems. To this end, the present application provides an outdoor walking device and a battery pack for powering an outdoor walking device.

[0006] In order to achieve the above-mentioned target, the present application adopts the following technical solution:

[0007] An outdoor walking device, comprising: a vehicle body, the vehicle body comprising a walking mechanism, a vehicle frame, and a support mechanism, the walking mechanism comprising walking wheels and a walking motor driving the walking wheels, the vehicle frame connecting the walking wheels, and the support mechanism being installed on the vehicle frame and configured to support a user; a power supply for powering electrical equipment in the vehicle body, the power supply comprising at least one battery pack, the battery pack comprising a battery pack shell and a battery cell module contained in the battery pack shell, the battery pack shell being supported by the vehicle body, and the battery cell module comprising a plurality of battery cells; each battery pack is configured with a nominal energy, and the ratio of the nominal energy of a single battery pack to the number of battery cells contained in the single battery pack is greater than or equal to 20Wh / cell.

[0008] In some embodiments, the battery cell is a cylindrical battery cell.

[0009] In some embodiments, the diameter of the cylindrical battery cell is greater than or equal to 40mm and less than or equal to 60mm.

[0010] In some embodiments, the length of the cylindrical cell is greater than or equal to 70 mm and less than or equal to 160 mm.

[0011] In some embodiments, the capacity of the single cell is greater than or equal to 5 Ah.

[0012] In some embodiments, the plurality of cells includes lithium iron phosphate cells.

[0013] In some embodiments, the plurality of cells includes ternary material cells.

[0014] In some embodiments, the volume of the cell module accounts for greater than or equal to 25% of the volume of the battery pack.

[0015] In some embodiments, the outdoor walking device includes a rider-type lawn mower, an all-terrain vehicle, or a rider-type snow blower.

[0016] An outdoor walking device, comprising: a vehicle body, the vehicle body including a walking mechanism, a vehicle frame, and a support mechanism, the walking mechanism including a walking wheel and a walking motor configured to drive the walking wheel to rotate, the vehicle frame connected to the walking wheel, the support mechanism mounted on the vehicle frame and configured to support a user; a power supply configured to supply power to electrical devices in the vehicle body, the power supply including at least one battery pack, the battery pack including a battery pack housing and a cell module housed in the battery pack housing, the battery pack housing supported by the vehicle body, the cell module including a plurality of cells; and wherein a volume of the cell module accounts for greater than or equal to 25% of a volume of the battery pack.

[0017] A battery pack for an outdoor walking device, comprising: a battery pack housing mounted to and supported by the outdoor walking device; and a cell module mounted to the battery pack housing, the cell module including a plurality of cells; wherein each battery pack is configured with a nominal energy, and a ratio of the nominal energy of a single battery pack to a number of cells of the single battery pack is greater than or equal to 20 Wh / cell.

[0018] In some embodiments, the cell is a cylindrical cell.

[0019] In some embodiments, the diameter of the cylindrical cell is greater than or equal to 40 mm and less than or equal to 60 mm.

[0020] In some embodiments, the length of the cylindrical cell is greater than or equal to 70 mm and less than or equal to 160 mm.

[0021] In some embodiments, the capacity of the cell is greater than or equal to 5 Ah.

[0022] In some embodiments, the energy density of the battery pack is greater than or equal to 140 Wh / kg.

[0023] In some embodiments, the plurality of cells includes lithium iron phosphate cells.

[0024] In some embodiments, the plurality of cells comprises ternary material cells.

[0025] In some embodiments, the volume ratio of the cell module to the battery pack is greater than or equal to 25%.

[0026] In some embodiments, the battery pack housing comprises a battery pack interface connected to the outdoor walking device.

[0027] An outdoor walking device, comprising: a vehicle body comprising a walking mechanism, a vehicle frame, and a support mechanism, the walking mechanism comprising a walking wheel and a walking motor driving the walking wheel to rotate, the vehicle frame being connected to the walking wheel, and the support mechanism being installed on the vehicle frame and configured to support an operator; a power supply supplying power to electrical equipment in the vehicle body; the power supply comprising a first energy storage unit and a second energy storage unit that are interchangeably connected to the vehicle body; the first energy storage unit comprising at least one first battery pack, the first battery pack comprising a first cell module, and the first cell module comprising a plurality of first cells; the second energy storage unit comprising at least one second battery pack, the second battery pack comprising a second cell module, and the second cell module comprising a plurality of second cells; the first energy storage unit and the second energy storage unit being configured with the same nominal energy, and the ratio of the number of cells of the first energy storage unit to the number of cells of the second energy storage unit being less than or equal to 0.4.

[0028] In some embodiments, the first energy storage unit and the second energy storage unit are alternatively connected to the outdoor walking device and supply power to electrical equipment in the outdoor walking device.

[0029] In some embodiments, the first cell is a cylindrical cell; and the second cell is a cylindrical cell.

[0030] In some embodiments, the diameter of the first cell is greater than the diameter of the second cell.

[0031] In some embodiments, the ratio of the diameter of the first cell to the diameter of the second cell is greater than or equal to 2.

[0032] In some embodiments, the diameter of the first cell is greater than or equal to 40 mm and less than or equal to 60 mm.

[0033] In some embodiments, when the first energy storage unit is installed to the vehicle body, the power supply has a first width in the front-rear direction; when the second energy storage unit is installed to the vehicle body, the power supply has a second width in the front-rear direction; and the first width is less than the second width.

[0034] In some embodiments, a plane defined by the support walking mechanism is a first plane; when the first energy storage unit is installed to the vehicle body, the distance from the center of gravity of the whole of the vehicle body and the power supply to the first plane in the up-down direction is a first height; when the second energy storage unit is installed to the vehicle body, the distance from the center of gravity of the whole of the vehicle body and the power supply to the first plane in the up-down direction is a second height; and the first height is less than the second height.

[0035] In some embodiments, the proportion of the volume of the first battery cell module in the volume of the first battery pack is greater than the proportion of the volume of the second battery cell module in the volume of the second battery pack.

[0036] In some embodiments, the outdoor walking equipment includes a manned mower or an all-terrain vehicle or a manned snow sweeper. BRIEF DESCRIPTION OF DRAWINGS

[0037] FIG. 1 is a structural schematic diagram of outdoor walking equipment provided by the present application;

[0038] FIG. 2 is a structural schematic diagram of a power supply mechanism provided by the present application;

[0039] FIG. 3 is an exploded structural schematic diagram of a battery pack provided by the present application;

[0040] FIG. 4 is a structural schematic diagram of a battery cell module provided by the present application;

[0041] FIG. 5 is a structural schematic diagram of a battery pack using 21700 specification ternary battery cells in the prior art;

[0042] FIG. 6 is a top view of a battery pack using 21700 specification ternary battery cells in the prior art;

[0043] FIG. 7 is a structural schematic diagram of a battery pack using 4695 specification lithium iron phosphate battery cells provided by the present application;

[0044] FIG. 8 is a top view of a battery pack using 4695 specification lithium iron phosphate battery cells provided by the present application;

[0045] FIG. 9 is a structural schematic diagram of another battery pack using 4695 specification ternary battery cells provided by the present application;

[0046] FIG. 10 is a top view of another battery pack using 4695 specification ternary battery cells provided by the present application;

[0047] FIG. 11 is a front view of outdoor walking equipment using a first energy storage unit provided by the present application;

[0048] FIG. 12 is a structural schematic diagram of a first energy storage unit provided by the present application;

[0049] FIG. 13 is a front view of outdoor walking equipment using another first energy storage unit provided by the present application;

[0050] FIG. 14 is a structural schematic diagram of another first energy storage unit provided by the present application;

[0051] FIG. 15 is a front view of outdoor walking equipment using a second energy storage unit provided by the present application;

[0052] Fig. 16 is a structural schematic diagram of a second energy storage unit provided by the present application. DETAILED DESCRIPTION

[0053] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0054] In the present application, the terms "comprising", "containing", "having" or any other similar words are intended to encompass non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0055] In the present application, the term "and / or" is a description of the association relationship between the associated objects, which means that there can be three kinds of relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects are in a "and / or" relationship.

[0056] In the present application, the terms "connection", "combination", "coupling", "mounting" can be direct connection, combination, coupling or mounting, or indirect connection, combination, coupling or mounting. Among them, for example, direct connection refers to the connection of two parts or components without the need for an intermediate part, and indirect connection refers to the connection of two parts or components with at least one intermediate part. The two parts or components are connected through the intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0057] In this application, those of ordinary skill in the art will understand that relative terms, such as "about", "approximately", "substantially" and the like, used in connection with a quantity or a condition (e.g., "about 1", "approximately 1", "substantially 1", etc.) are intended to include the stated value and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with a measurement of the particular value and tolerances that are expected to result from manufacturing, assembling, using, etc. of the particular value. Such terms are also to be construed to disclose a range defined by the absolute values of the two endpoints. The relative terms can refer to a plus or minus percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Values that do not employ relative terms are also to be disclosed as particular values with tolerances. In addition, "substantially" when used in the context of relative angular positional relationships (e.g., substantially parallel, substantially perpendicular) can refer to a plus or minus number of degrees (e.g., 1 degree, 5 degrees, 10 degrees or more) from the indicated angle.

[0058] In this application, those of ordinary skill in the art will understand that a function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, a function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0059] In this application, the terms "upper", "lower", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, it is also understood in the context that when referring to an element connected to another element "on" or "under", it can not only be directly connected to another element "on" or "under", but also indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, left below, right below, front below and back below, etc.

[0060] In order to clearly illustrate the technical solutions of the present application, the upper side, the lower side, the left side and the right side are defined in the drawings of the specification.

[0061] As shown in FIG. 1, the outdoor walking device 100 disclosed in the present application can be ridden or stood on by a user for control. The outdoor walking device 100 can be a rider-type lawn mower for trimming lawns and other vegetation. The outdoor walking device 100 can also be a utility vehicle (UTV). In the related art, the utility vehicle includes an all-terrain vehicle (ATV), a multi-purpose all-terrain vehicle, and an entertainment venue vehicle. The outdoor walking device 100 can also be a rider-type snowplow that can walk outdoors and perform snowplowing functions. The outdoor walking device 100 can also be an electric motorcycle, a cleaning machine, and an agricultural vehicle such as a harvester or a pesticide spraying vehicle.

[0062] The front, rear, left, right, up, and down directions are described as the directions shown in FIG. 1. Specifically, when a user rides or stands on the outdoor walking device 100 on the ground, the direction facing the user is defined as the front direction, the direction facing away from the user is defined as the rear direction, the direction on the left side of the user is defined as the left direction, the direction on the right side of the user is defined as the right direction, the direction close to the ground is defined as the down direction, and the direction away from the ground is defined as the up direction.

[0063] As shown in FIGS. 1 to 3, in the present embodiment, the outdoor walking device 100 is taken as an example of a rider-type working machine. The outdoor walking device 100 includes a vehicle body 10 and a power source 20.

[0064] The vehicle body 10 includes a vehicle frame 11, a walking mechanism 12, an operating mechanism 13, and a support mechanism 14. The vehicle frame 11 extends substantially in the front-rear direction, and is configured to mount the walking mechanism 12, the operating mechanism 13, and the support mechanism 14. The support mechanism 14 is configured to support an operator. Optionally, the support mechanism 14 includes a seat. The seat is mounted to the vehicle frame 11 and is configured to allow a user to ride. In other alternative embodiments, the support mechanism 14 also includes a platform for a user to stand on.

[0065] The operating mechanism 13 includes an operating member 131. The operating member 131 is operated by a user to control the outdoor walking device 100 to move forward, backward, and turn. Exemplarily, the operating member 131 is an operating lever, and the operating member 131 includes left and right operating members that can be gripped by a user. In some embodiments, the operating mechanism 13 can also include a steering wheel assembly, including a circular standard steering wheel, a flat-bottom or flat-top steering wheel, a rectangular steering wheel, a multifunction steering wheel, a folding steering wheel, a touch-control steering wheel, etc.

[0066] In the embodiment, the walking mechanism 12 comprises walking wheels and walking motors (not shown) for driving the walking wheels to rotate. The walking wheels comprise rear walking wheels 121 and front walking wheels 122. The rear walking wheels 121 comprise left and right rear walking wheels. The front walking wheels 122 comprise left and right front walking wheels. The walking motors drive the rear walking wheels 121 or the front walking wheels 122 to rotate, so as to realize the walking function of the outdoor walking device 100. Optionally, the number of the walking motors can be one, two, three or four. In the embodiment, the number of the walking motors is two, and the two walking motors drive the left and right rear walking wheels respectively, so that the outdoor walking device 100 can turn in other directions deviating from the front-rear direction.

[0067] The power supply 20 supplies power for the electrical equipment in the vehicle body 10, and at least supplies power for the walking motors. The walking motors output power to drive the walking wheels, so that the outdoor walking device 100 can walk according to the operation, so that the manned working machine can be used as an electric power tool capable of carrying a person. Compared with the oil-based manned working machine, the electric manned working machine is more environmentally friendly and more energy-saving.

[0068] As shown in FIGS. 2-4, the power supply 20 comprises at least one battery pack 21, and the battery pack 21 is detachably connected with the vehicle frame 11. The battery pack 21 comprises a battery pack shell 211 and a battery cell module 212, the battery pack shell 211 is supported by the vehicle body 10, and the battery cell module 212 is installed to the battery pack shell 211. For example, the battery pack shell 211 comprises a battery pack interface connected with the vehicle body 10, so that the battery pack 21 can be directly connected with the vehicle frame 11. For example, the power supply 20 further comprises a connecting piece 22 for installing the battery pack 21 to connect the battery pack 21 to the outdoor walking device 100. The battery pack 21 is detachably connected to the connecting piece 22, and the connecting piece 22 is detachably installed to the vehicle frame 11, so that it can be taken out to adapt to other electrical equipment. The connecting piece 22 can connect one battery pack 21, or at least two battery packs 21.

[0069] In some embodiments, the connecting member 22 can be a battery compartment. In some embodiments, the connecting member 22 can be a mounting seat. As shown in FIG. 2, the connecting member 22 is a battery compartment, which is formed with an accommodation space for accommodating the battery pack 21, and the battery pack 21 is detachably arranged in the accommodation space. For example, the battery compartment is formed or connected with a connecting portion, which is configured to achieve detachable electrical connection between the battery compartment and the battery pack 21, and the connecting portion can also fix the battery pack 21 in the accommodation space of the battery compartment, so as to avoid the battery pack 21 from shaking relative to the battery compartment due to vibration of the outdoor walking equipment 100 during driving or performing a working function, and to avoid poor contact. The battery compartment is detachably connected with the frame 11 of the outdoor walking equipment 100. A plurality of battery packs 21 can be connected in parallel or in series to simultaneously supply power to the outdoor walking equipment 100; or, some of the battery packs 21 can be used as backup battery packs.

[0070] The battery cell module 212 includes a plurality of battery cells 2121 connected in series or in parallel. The battery cell 2121 is the smallest electrochemical unit that can be independently physically detached and replaced in the battery cell module 212. The battery cell 2121 includes a shell (metal hard shell or aluminum plastic film soft shell), which accommodates electrolyte or electrolyte that generates ion movement, and includes a positive plate and a negative plate arranged inside the shell, the positive plate and the negative plate being respectively coated with lithium ion battery positive and negative active materials; a separator arranged between the positive plate and the negative plate, configured to be electronically insulated and allow ions to pass through; and a positive electrode column of the battery cell electrically connected with the positive plate 2121b and extending out of the shell, and a negative electrode column of the battery cell electrically connected with the negative plate and extending out of the shell. During charging and discharging, lithium ions in the electrolyte or electrolyte migrate between the positive plate 2121b and the negative plate 2121c through the separator 2121d, to achieve storage and release of electrical energy.

[0071] The battery pack shell 211 is formed with an accommodation cavity for accommodating the battery cell module 212. In one embodiment, the battery pack shell 211 can include an upper cover, a barrel, and a lower cover, which can constitute a substantially closed accommodation cavity. Of course, the battery pack shell 211 can also include left and right shells or upper and lower shells, or other assembled forms of shells. The battery pack shell 211 is provided with a terminal assembly, and the battery pack 21 is electrically connected with the electronic equipment to be powered through the terminal assembly.

[0072] In order to facilitate the operation of the user, the battery pack shell 211 can also be provided with a handle assembly 214 to facilitate the user to lift and pull the battery pack 21. In one embodiment, the handle assembly 214 can include one or more handles. For example, the handle assembly 214 can include two separate handles, which can be arranged on the same face of the battery pack shell 211, or can be arranged on different faces of the battery pack shell 211.

[0073] The plurality of battery cells 2121 included in the battery cell module 212 can be connected in series and / or in parallel. In some embodiments, the battery pack 21 includes lithium iron phosphate (LiFeP04, LEP) battery cells. In some embodiments, the battery pack 21 includes ternary material (lithium nickel cobalt manganese oxide, NCM) battery cells. In some embodiments, all battery cells 2121 within one battery pack 21 are lithium iron phosphate battery cells. In some embodiments, all battery cells 2121 within one battery pack 21 are ternary (lithium nickel cobalt manganese oxide, NCM) material battery cells.

[0074] FIGS. 5 and 6 show a battery pack in the related art adopting 21700 specifications (diameter about 21 mm, height about 70.0 mm), cylindrical ternary (lithium nickel cobalt manganese oxide, NCM) battery cells, and a total capacity of 3.48 kWh.

[0075] FIGS. 7 and 8 show one battery pack 21 of the present embodiment adopting 4695 specifications (diameter about 46 mm, height about 95 mm), cylindrical lithium iron phosphate battery cells, and FIGS. 9 and 10 show another battery pack 21 of the present embodiment adopting 4695 specifications (diameter about 46 mm, height about 95 mm), cylindrical ternary (lithium nickel cobalt manganese oxide, NCM) battery cells. As shown in Table 1 below, parameters of the 21700 ternary battery cells and cylindrical battery cells (hereinafter referred to as 46 series battery cells, diameter about 46 mm, different heights) with a diameter of 46 mm are shown.

[0076] Table 1 Battery cell parameters

[0077]

[0078] Each battery pack 21 is configured with a nominal energy, and the ratio of the nominal energy of a single battery pack 21 to the number of battery cells of a single battery pack 21 (unit: Wh / cell) is greater than or equal to 20 Wh / cell. In a battery pack 21 of the same capacity, the number of battery cells 2121 is reduced, thereby facilitating management and disassembly; and reducing the space occupied by the connecting members and structural members, and improving the overall volume utilization rate of the battery pack. In one embodiment, the ratio of the nominal energy of a single battery pack 21 to the number of battery cells of a single battery pack 21 is greater than or equal to 50 Wh / cell or 100 Wh / cell. In one embodiment, the ratio of the nominal energy of a single battery pack 21 to the number of battery cells of a single battery pack 21 is greater than or equal to 30 Wh / cell, 40 Wh / cell, 50 Wh / cell, 60 Wh / cell, 70 Wh / cell, 80 Wh / cell, 90 Wh / cell, 100 Wh / cell, 110 Wh / cell, 120 Wh / cell, 130 Wh / cell, 140 Wh / cell, 150 Wh / cell, or 160 Wh / cell.

[0079] The number of battery cells 2121 needed for a battery pack 21 of the same capacity using cylindrical battery cells with a diameter of 46 mm (hereinafter referred to as 46 series battery cells) is reduced by about 15% to 37% of the number of battery cells of a battery pack of 21700 specification battery cells, facilitating management and disassembly. By reducing the number of battery cells 2121, the space occupation is reduced. For 21700 specification ternary battery cells, the ratio of the nominal energy of a single battery pack 21 to the number of battery cells of a single battery pack 21 is equal to 17.7 Wh / cell. For 4680 lithium iron phosphate (LiFeP04) battery cells, the ratio of the nominal energy of a single battery pack 21 to the number of battery cells of a single battery pack 21 is equal to 48 Wh / cell. For 46120 lithium iron phosphate (LiFeP04) battery cells, the ratio of the nominal energy of a single battery pack 21 to the number of battery cells of a single battery pack 21 is equal to 76.8 Wh / cell. For 4695 lithium iron phosphate (LiFeP04) battery cells, the ratio of the nominal energy of a single battery pack 21 to the number of battery cells of a single battery pack 21 is equal to 60.8 Wh / cell. For 4695 specification ternary lithium battery cells, the ratio of the nominal energy of a single battery pack 21 to the number of battery cells of a single battery pack 21 is equal to 122 Wh / cell.

[0080] In the related art, for 21700 specification ternary battery cells, the diameter is less than 40 mm, and the diameter is usually 21 mm, and the length is equal to 70 mm. In the present embodiment, the battery cell 2121 is a cylindrical battery cell. The diameter of the cylindrical battery cell is greater than or equal to 40 mm and less than or equal to 60 mm. In some embodiments, the diameter of the cylindrical battery cell is 40 mm, 45 mm, 46 cm, 50 cm, 55 cm, or 60 cm. In some embodiments, the diameter of the cylindrical battery cell is greater than or equal to 46 mm, for example, it can be 46 mm, 48 cm, or 50 mm, etc. In some embodiments, the cylindrical battery cell uses 46 series battery cells.

[0081] The length of the cylindrical battery cell is greater than or equal to 70 mm and less than or equal to 160 mm. In some embodiments, the length of the cylindrical battery cell is greater than or equal to 80 mm and less than or equal to 150 mm. In some embodiments, the length of the cylindrical battery cell is 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, or 160 mm, etc.

[0082] Referring to FIG. 3, for the battery pack 21, the battery pack 21 includes a battery pack shell 211 and a cell module 212, and further includes a support 213 and a battery management system (BMS) control board (not shown in the figure) arranged in the battery pack shell 211, etc., the support 213 is configured to support the cell module 212. It should be particularly pointed out that the cell module 212 itself does not include the support 213, the control board and other peripheral components. The cell module 212 is composed of a plurality of cells 2121 and necessary electrical connection structures for realizing series and parallel connection between the cells, such as busbars, connecting sheets, insulating separators, etc. Considering the structures of the support 213, the control board and the like, the overall volume utilization rate of the battery pack is shown in Table 2. Table 2 shows the overall volume utilization rate of the existing 21700 ternary battery pack and the 46 series battery pack 21 used in the embodiment.

[0083] Table 2 Overall volume utilization rate

[0084]

[0085] As can be seen from Table 2, the battery pack using the 46 series cell of the present application has an overall volume utilization rate improvement ratio of more than 20% compared with the battery pack using the 21700 ternary cell. The overall volume of the battery pack can be calculated by three-dimensional modeling software (such as SolidWorks, CATIA, UG, etc.), and the related calculation method is common knowledge in the art, which will not be described here.

[0086] In some embodiments, the volume of the cell module 212 accounts for greater than or equal to 25% of the volume of the battery pack 21. In some embodiments, the volume of the cell module 212 accounts for greater than or equal to 30% of the volume of the battery pack 21. In some embodiments, the volume of the cell module 212 accounts for greater than or equal to 34% of the volume of the battery pack 21.

[0087] The capacity of a single cell 2121 is greater than or equal to 5Ah. In some embodiments, the capacity of the cell 2121 is greater than or equal to 10Ah. In some embodiments, the capacity of the cell 2121 is greater than or equal to 15Ah. In some embodiments, the capacity of the cell 2121 is greater than or equal to 20Ah. In some embodiments, the capacity of the cell 2121 is 5Ah, 10Ah, 15Ah, 20Ah, 25Ah, 30Ah, 35Ah or 40Ah.

[0088] The energy density of the battery pack 21 is greater than or equal to 140 Wh / kg. In some embodiments, the energy density of the battery pack 21 is greater than or equal to 150 Wh / kg. In some embodiments, the energy density of the battery pack 21 is greater than or equal to 160 Wh / kg. In some embodiments, the energy density of the battery pack 21 is greater than or equal to 180 Wh / kg. In some embodiments, the energy density of the battery pack 21 is greater than or equal to 200 Wh / kg. In some embodiments, the energy density of the battery pack 21 is 140 Wh / kg, 160 Wh / kg, 180 Wh / kg, 200 Wh / kg, 220 Wh / kg, or 240 Wh / kg.

[0089] In the present embodiment, the weight of the battery pack 21 is less than or equal to 25 kg. In one embodiment, the weight of the battery pack 21 is greater than or equal to 29 kg, or greater than or equal to 33 kg, or greater than or equal to 37 kg, or less than or equal to 22 kg, or less than or equal to 19 kg, or greater than or equal to 16 kg, for example the weight of the battery pack 21 is 16 kg, 25 kg, or 37 kg, etc.

[0090] The nominal voltage of the battery pack 21 is about 56 V, for example, it can be 54 V or 58 V, etc. In one embodiment, the nominal voltage of the battery pack 21 is greater than or equal to 56 V, or the nominal voltage of the battery pack 21 is greater than or equal to 50 V, or the nominal voltage of the battery pack 21 is greater than or equal to 48 V, or the nominal voltage of the battery pack 21 is greater than or equal to 40 V.

[0091] The capacity of the battery pack 21 is greater than or equal to 20 Ah. In one embodiment, the capacity of the battery pack 21 is greater than or equal to 30 Ah, or the capacity of the battery pack 21 is greater than or equal to 40 Ah, or the capacity of the battery pack 21 is greater than or equal to 50 Ah. For example, it can be 20 Ah, 30 Ah, 40 Ah, 50 Ah, etc. The ratio of the capacity to the weight of the battery pack 21 is greater than or equal to 2 Ah / kg, for example, 2 Ah / kg, 3 Ah / kg, 4 Ah / kg, 5 Ah / kg, etc.

[0092] The energy of the battery pack 21 is greater than or equal to 2 kW·h. In one embodiment, the energy of the battery pack 21 is greater than or equal to 3 kW·h, or the energy of the battery pack 21 is greater than or equal to 4 kW·h, or the energy of the battery pack 21 is greater than or equal to 5 kW·h. For example, the energy of the battery pack 21 can be 2 kW·h, 3 kW·h, 4 kW·h, 5 kW·h, etc.

[0093] In some embodiments, referring to FIGS. 11-16, the power supply 20 includes a first energy storage unit 20a and a second energy storage unit 20b interchangeably connected to the vehicle body 10. The first energy storage unit 20a includes at least one first battery pack 21a, which includes a first battery cell module 212a including a plurality of first battery cells 2121a; and the second energy storage unit 20b includes at least one second battery pack 21b, which includes a second battery cell module 212b including a plurality of second battery cells 2121b.

[0094] In some embodiments, the first energy storage unit 20a and the second energy storage unit 20b interchangeably connected to the vehicle body 10 include at least two embodiments, including a first embodiment in which the first energy storage unit 20a and the second energy storage unit 20b are physically compatible and electrically compatible for interchange, but are mutually exclusive for use on one outdoor walking device 100, i.e., cannot be used simultaneously on one outdoor walking device 100. That is, one outdoor walking device 100 can only choose to install either the first energy storage unit 20a or the second energy storage unit 20b, and cannot install both. The type of adaptive energy storage unit is generally pre-set before shipment, and can be replaced with another type of energy storage unit according to the device upgrade needs at a later time. A second embodiment is that the first energy storage unit 20a and the second energy storage unit 20b can be completely interchangeable, or the first energy storage unit 21a and the second energy storage unit 21b can be partially interchangeable, i.e., the battery packs included in the first energy storage unit 20a and the second energy storage unit 20b can be mixed for use, i.e., one outdoor walking device 100 can be configured in one of the following configurations: the first battery pack 21a of the first energy storage unit 20a and the second battery pack 21b of the second energy storage unit 20b can be installed simultaneously, or the first battery pack 21a of the first energy storage unit 20a can be installed entirely, or the second battery pack 21b of the second energy storage unit 20b can be installed entirely.

[0095] In this embodiment, the first energy storage unit 20a and the second energy storage unit 20b are connected to the outdoor walking device 100 alternatively, and supply power to the electrical devices in the outdoor walking device 100. That is, the first energy storage unit 20a and the second energy storage unit 20b can be interchangeable, but cannot be used simultaneously on one outdoor walking device 100, and one outdoor walking device 100 can only use the first energy storage unit 20a or the second energy storage unit 20b.

[0096] In some embodiments, the second energy storage unit 20b and the first energy storage unit 20a of the outdoor walking device 100 are designed with standardized mechanical and electrical interfaces, so that the first energy storage unit 20a can selectively replace all or part of the second energy storage unit 20b.

[0097] Referring to FIGS. 15 and 16, the second energy storage unit 20b is connected to the outdoor walking device 100, the second energy storage unit 20b adopts 21700 specification ternary cells, and the second energy storage unit 20b includes four second battery packs 21b, each of which includes 196 of the above-mentioned cells.

[0098] Referring to FIGS. 11 and 12, the first energy storage unit 20a is connected to the outdoor walking device 100, the first energy storage unit 20a adopts 4695 specification ternary cells, and the first energy storage unit 20a includes four first battery packs 21a, each of which includes 28 4695 specification ternary cells. In one configuration (see FIGS. 11 and 12), the 4695 specification lithium ion cells are arranged in a vertical arrangement in the first battery pack 21a. This configuration reduces the occupied space, thereby providing more space for the seat area.

[0099] Referring to FIGS. 13 and 14, the first energy storage unit 20a adopts 4695 specification ternary cells, and the 4695 specification ternary cells are arranged in a horizontal arrangement, the first energy storage unit 20a includes four first battery packs 21a, each of which includes 28 4695 specification ternary cells, and the first energy storage unit 20a has a lower center of gravity and is more stable.

[0100] The first energy storage unit 20a and the second energy storage unit 20b are configured with the same nominal energy, and the ratio of the number of cells of the first energy storage unit 20a to the number of cells of the second energy storage unit 20b is less than or equal to 0.4. The number of cells 2121 of the first energy storage unit 20a is reduced, facilitating management and disassembly; by reducing the number of cells 2121, the space occupation is reduced, and the volume utilization rate of the whole pack is improved.

[0101] In some embodiments, the first energy storage unit 20a and the second energy storage unit 20b are configured with the same nominal energy, and the ratio of the number of cells of the first energy storage unit 20a to the number of cells of the second energy storage unit 20b is equal to 0.35, 0.3, 0.25, 0.2, or 0.15.

[0102] In the present embodiment, the first cell 2121a is a cylindrical cell; the second cell 2121b is a cylindrical cell. The first cell 2121a adopts a 46 series cell, and the second cell 2121b adopts a 21700 specification ternary cell. The diameter of the first cell 2121a is greater than the diameter of the second cell 2121b. With the same nominal energy, a smaller number of first cells 2121a are used to form a battery pack, reducing the number of cells and facilitating management. In some embodiments, the first cell 2121a adopts a 46 series cell with a diameter of 46 mm, and the second cell 2121b adopts a 21700 specification ternary cell with a diameter of 21 mm.

[0103] In some embodiments, the ratio of the diameter of the first battery cell 2121a to the diameter of the second battery cell 2121b is greater than or equal to 2. The diameter of the first battery cell 2121a is larger, so fewer first battery cells 2121a are used, reducing the number of battery cells.

[0104] In some embodiments, the diameter of the first battery cell 2121a is greater than or equal to 40 mm and less than or equal to 60 mm. It can be 40 mm, 45 mm, 46 cm, 50 cm, 55 cm, or 60 cm.

[0105] In some embodiments, the length of the first battery cell 2121a is greater than or equal to the length of the second battery cell 2121b. In some embodiments, the length of the first battery cell 2121a is greater than or equal to 70 mm and less than or equal to 160 mm. The length of the second battery cell 2121b is equal to 70 mm.

[0106] Referring to FIGS. 11, 12, 15, and 16, when the first energy storage unit 20a is installed to the vehicle body 10, the power supply 20 has a first width D1 in the front-rear direction; when the second energy storage unit 20b is installed to the vehicle body 10, the power supply 20 has a second width D2 in the front-rear direction; and the first width D1 is less than the second width D2. The first energy storage unit 20a occupies less space.

[0107] In some embodiments, the first width D1 is less than or equal to 340 mm, and the second width D2 is greater than or equal to 550 mm. In some embodiments, the first energy storage unit 20a uses 4695-specification ternary battery cells, and the battery cells are arranged vertically, and the first width D1 is equal to 300 mm. The second energy storage unit 20b uses 21700-specification ternary battery cells, and the second width D2 is equal to 610 mm.

[0108] Referring to FIGS. 13 to 16, a plane defining the support walking mechanism 12 is defined as a first plane 101; when the first energy storage unit 20a is installed to the vehicle body 10, the distance from the center of gravity of the whole of the vehicle body 10 and the power supply 20 to the first plane 101 in the up-down direction is a first height H1; when the second energy storage unit 20b is installed to the vehicle body 10, the distance from the center of gravity of the whole of the vehicle body 10 and the power supply 20 to the first plane 101 in the up-down direction is a second height H2; and the first height H1 is less than the second height H2. The first energy storage unit 20a has a lower center of gravity.

[0109] In some embodiments, the first height H1 is less than or equal to 330 mm, and the second height H2 is greater than 330 mm. In some embodiments, the first energy storage unit 20a uses 4695-specification ternary battery cells, and the battery cells are arranged horizontally, and the first height H1 is equal to 320 mm. The second energy storage unit 20b uses 21700-specification ternary battery cells, and the second height H2 is equal to 350 mm.

[0110] The proportion of the volume of the first battery cell module 212a in the volume of the first battery pack 21a is greater than the proportion of the volume of the second battery cell module 212b in the volume of the second battery pack 21b. The greater volume proportion of the first battery cell module 212a improves the energy density of the first battery pack 21a.

[0111] In some embodiments, the first battery cell 2121a adopts a 46 series battery cell, and the second battery cell 2121b adopts a 21700 specification ternary battery cell. As shown in Table 3, the proportion of the volume of the second battery cell module 212b in the volume of the second battery pack 21b is equal to 25%, and the proportion of the volume of the first battery cell module 212a in the volume of the first battery pack 21a is 30.8% or 34%.

[0112] In the outdoor walking device 100, by replacing the existing 21700 specification battery cell with a 46 series battery cell, the number of battery cells is reduced, the BMS management and thermal management are easier, and the device is easier to disassemble and assemble. The utilization rate of the volume of the whole pack is improved, making the structure more compact; the device is easy to disassemble and assemble, providing more space for the seat, and the seat can be placed further back; the center of gravity is lower, and the structure is more stable.

[0113] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. An outdoor walking device, comprising: a vehicle body, the vehicle body comprising a walking mechanism, a vehicle frame and a supporting mechanism, the walking mechanism comprising a walking wheel and a walking motor driving the walking wheel, the vehicle frame connecting the walking wheel, the supporting mechanism being installed on the vehicle frame and configured to support a user; a power supply, the power supply supplying power to electrical devices in the vehicle body, the power supply comprising at least one battery pack, the battery pack comprising a battery pack shell and a cell module accommodated in the battery pack shell, the battery pack shell being supported by the vehicle body, the cell module comprising a plurality of cells; each of the battery packs is configured with a nominal energy, and a ratio of the nominal energy of a single battery pack to the number of cells contained in the single battery pack is greater than or equal to 20 Wh / cell.

2. The outdoor walking apparatus according to claim 1, wherein The cells are cylindrical cells.

3. The outdoor walking apparatus according to claim 2, wherein The diameter of the cylindrical cells is greater than or equal to 40 mm and less than or equal to 60 mm.

4. The outdoor walking apparatus according to claim 2, wherein The length of the cylindrical cells is greater than or equal to 70 mm and less than or equal to 160 mm.

5. The outdoor walking apparatus according to claim 1, wherein, The capacity of a single cell is greater than or equal to 5 Ah.

6. The outdoor walking apparatus according to claim 1, wherein The plurality of cells comprises lithium iron phosphate cells.

7. The outdoor walking apparatus according to claim 1, wherein The plurality of cells comprises ternary material cells.

8. The outdoor walking apparatus according to claim 1, wherein, The volume of the cell module accounts for greater than or equal to 25% of the volume of the battery pack.

9. The outdoor walking apparatus according to claim 1, wherein, The outdoor walking device comprises a manned mower, an all-terrain vehicle or a manned snow sweeper. 10.An outdoor walking device, comprising: a vehicle body, the vehicle body comprising a walking mechanism, a vehicle frame and a supporting mechanism, the walking mechanism comprising a walking wheel and a walking motor driving the walking wheel, the vehicle frame connecting the walking wheel, the supporting mechanism being installed on the vehicle frame and configured to support a user; a power supply, the power supply supplying power to electrical devices in the vehicle body, the power supply comprising at least one battery pack, the battery pack comprising a battery pack shell and a cell module accommodated in the battery pack shell, the battery pack shell being supported by the vehicle body, the cell module comprising a plurality of cells; the volume of the cell module accounts for greater than or equal to 25% of the volume of the battery pack. 11.A battery pack for an outdoor walking device, comprising: a battery pack shell, the battery pack shell being installed to and supported by the outdoor walking device; a cell module, the cell module being installed to the battery pack shell, the cell module comprising a plurality of cells; each of the battery packs is configured with a nominal energy, and a ratio of the nominal energy of a single battery pack to the number of cells contained in the single battery pack is greater than or equal to 20 Wh / cell.

12. The battery pack for an outdoor walking device according to claim 11, wherein, The cells are cylindrical cells.

13. The battery pack for an outdoor walking device according to claim 12, wherein, The diameter of the cylindrical cells is greater than or equal to 40 mm and less than or equal to 60 mm.

14. The battery pack for an outdoor walking device according to claim 12, wherein, The length of the cylindrical cells is greater than or equal to 70 mm and less than or equal to 160 mm.

15. The battery pack for an outdoor walking device of claim 11, wherein, The capacity of a single cell is greater than or equal to 5 Ah.

16. The battery pack for an outdoor walking device of claim 11, wherein, The energy density of the battery pack is greater than or equal to 140 Wh / kg.

17. The battery pack for an outdoor walking device of claim 11, wherein, The plurality of cells comprises lithium iron phosphate cells.

18. The battery pack for an outdoor walking device of claim 11, wherein, The plurality of cells comprises ternary material cells.

19. The battery pack for an outdoor walking device of claim 11, wherein, The volume of the cell module accounts for greater than or equal to 25% of the volume of the battery pack.

20. The battery pack for an outdoor walking device of claim 11, wherein, The battery pack shell comprises a battery pack interface connected to the outdoor walking device.

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